Finding the Fourth Proportional to 1,111.16, 1,532.12 and 717.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.16 : 1,532.12 = 717.50 : x
2. Step 2: Convert to fraction form
   1,111.16/1,532.12 = 717.50/x
3. Step 3: Cross multiply
   1,111.16x = 1,532.12 × 717.50
4. Step 4: Simplify right side
   1,111.16x = 1,099,296.10
5. Step 5: Solve for x
   x = 1,099,296.10/1,111.16
6. Step 6: Final answer
   x = 989.32