Finding the Fourth Proportional to 1,565.31, 2,160.12 and 902.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,565.31 : 2,160.12 = 902.15 : x
2. Step 2: Convert to fraction form
   1,565.31/2,160.12 = 902.15/x
3. Step 3: Cross multiply
   1,565.31x = 2,160.12 × 902.15
4. Step 4: Simplify right side
   1,565.31x = 1,948,755.40
5. Step 5: Solve for x
   x = 1,948,755.40/1,565.31
6. Step 6: Final answer
   x = 1,244.97