Finding the Fourth Proportional to 1,131.52, 1,560.96 and 716.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.52 : 1,560.96 = 716.80 : x
2. Step 2: Convert to fraction form
   1,131.52/1,560.96 = 716.80/x
3. Step 3: Cross multiply
   1,131.52x = 1,560.96 × 716.80
4. Step 4: Simplify right side
   1,131.52x = 1,118,896.13
5. Step 5: Solve for x
   x = 1,118,896.13/1,131.52
6. Step 6: Final answer
   x = 988.84