Finding the Fourth Proportional to 1,123.10, 1,550.34 and 820.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.10 : 1,550.34 = 820.73 : x
2. Step 2: Convert to fraction form
   1,123.10/1,550.34 = 820.73/x
3. Step 3: Cross multiply
   1,123.10x = 1,550.34 × 820.73
4. Step 4: Simplify right side
   1,123.10x = 1,272,414.42
5. Step 5: Solve for x
   x = 1,272,414.42/1,123.10
6. Step 6: Final answer
   x = 1,132.95