Finding the Fourth Proportional to 1,002.91, 1,383.96 and 560.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,002.91 : 1,383.96 = 560.72 : x
2. Step 2: Convert to fraction form
   1,002.91/1,383.96 = 560.72/x
3. Step 3: Cross multiply
   1,002.91x = 1,383.96 × 560.72
4. Step 4: Simplify right side
   1,002.91x = 776,018.04
5. Step 5: Solve for x
   x = 776,018.04/1,002.91
6. Step 6: Final answer
   x = 773.77