Finding the Fourth Proportional to 1,131.30, 1,560.87 and 868.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.30 : 1,560.87 = 868.86 : x
2. Step 2: Convert to fraction form
   1,131.30/1,560.87 = 868.86/x
3. Step 3: Cross multiply
   1,131.30x = 1,560.87 × 868.86
4. Step 4: Simplify right side
   1,131.30x = 1,356,177.51
5. Step 5: Solve for x
   x = 1,356,177.51/1,131.30
6. Step 6: Final answer
   x = 1,198.78