Finding the Fourth Proportional to 1,087.50, 1,632.56 and 916.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.50 : 1,632.56 = 916.32 : x
2. Step 2: Convert to fraction form
   1,087.50/1,632.56 = 916.32/x
3. Step 3: Cross multiply
   1,087.50x = 1,632.56 × 916.32
4. Step 4: Simplify right side
   1,087.50x = 1,495,942.80
5. Step 5: Solve for x
   x = 1,495,942.80/1,087.50
6. Step 6: Final answer
   x = 1,375.58