To calculate the sum of the numbers \( 365 + 925 + 3.698 + 7.299 + 2.520 \):
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Start by adding the whole numbers:
- \( 365 + 925 = 1290 \)
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Next, add the decimal numbers:
- \( 3.698 + 7.299 = 10.997 \)
- Then add \( 10.997 + 2.520 = 13.517 \)
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Finally, combine the results from step 1 and step 2:
- \( 1290 + 13.517 = 1303.517 \)
Thus, the total sum is \( \boxed{1303.517} \).