Finding the Fourth Proportional to 1,089.76, 1,503.96 and 892.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,089.76 : 1,503.96 = 892.72 : x
2. Step 2: Convert to fraction form
   1,089.76/1,503.96 = 892.72/x
3. Step 3: Cross multiply
   1,089.76x = 1,503.96 × 892.72
4. Step 4: Simplify right side
   1,089.76x = 1,342,615.17
5. Step 5: Solve for x
   x = 1,342,615.17/1,089.76
6. Step 6: Final answer
   x = 1,232.03