Finding the Fourth Proportional to 1,087.71, 1,498.55 and 892.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.71 : 1,498.55 = 892.50 : x
2. Step 2: Convert to fraction form
   1,087.71/1,498.55 = 892.50/x
3. Step 3: Cross multiply
   1,087.71x = 1,498.55 × 892.50
4. Step 4: Simplify right side
   1,087.71x = 1,337,451.41
5. Step 5: Solve for x
   x = 1,337,451.41/1,087.71
6. Step 6: Final answer
   x = 1,229.60