Finding the Fourth Proportional to 1,002.79, 1,383.85 and 560.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,002.79 : 1,383.85 = 560.69 : x
2. Step 2: Convert to fraction form
   1,002.79/1,383.85 = 560.69/x
3. Step 3: Cross multiply
   1,002.79x = 1,383.85 × 560.69
4. Step 4: Simplify right side
   1,002.79x = 775,910.86
5. Step 5: Solve for x
   x = 775,910.86/1,002.79
6. Step 6: Final answer
   x = 773.75