Finding the Fourth Proportional to 1,088.69, 1,631.07 and 916.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,088.69 : 1,631.07 = 916.43 : x
2. Step 2: Convert to fraction form
   1,088.69/1,631.07 = 916.43/x
3. Step 3: Cross multiply
   1,088.69x = 1,631.07 × 916.43
4. Step 4: Simplify right side
   1,088.69x = 1,494,753.32
5. Step 5: Solve for x
   x = 1,494,753.32/1,088.69
6. Step 6: Final answer
   x = 1,372.99