Finding the Fourth Proportional to 1,002.87, 1,383.93 and 560.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,002.87 : 1,383.93 = 560.79 : x
2. Step 2: Convert to fraction form
   1,002.87/1,383.93 = 560.79/x
3. Step 3: Cross multiply
   1,002.87x = 1,383.93 × 560.79
4. Step 4: Simplify right side
   1,002.87x = 776,094.10
5. Step 5: Solve for x
   x = 776,094.10/1,002.87
6. Step 6: Final answer
   x = 773.87