Finding the Fourth Proportional to 3,490.72, 5,239.86 and 2,513.68

Step by Step Solution

1. Step 1: Write the proportion equation
   3,490.72 : 5,239.86 = 2,513.68 : x
2. Step 2: Convert to fraction form
   3,490.72/5,239.86 = 2,513.68/x
3. Step 3: Cross multiply
   3,490.72x = 5,239.86 × 2,513.68
4. Step 4: Simplify right side
   3,490.72x = 13,171,331.28
5. Step 5: Solve for x
   x = 13,171,331.28/3,490.72
6. Step 6: Final answer
   x = 3,773.24