Finding the Fourth Proportional to 1,023.06, 1,411.83 and 557.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,023.06 : 1,411.83 = 557.31 : x
2. Step 2: Convert to fraction form
   1,023.06/1,411.83 = 557.31/x
3. Step 3: Cross multiply
   1,023.06x = 1,411.83 × 557.31
4. Step 4: Simplify right side
   1,023.06x = 786,826.98
5. Step 5: Solve for x
   x = 786,826.98/1,023.06
6. Step 6: Final answer
   x = 769.09