Finding the Fourth Proportional to 1,105.49, 1,658.57 and 557.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.49 : 1,658.57 = 557.48 : x
2. Step 2: Convert to fraction form
   1,105.49/1,658.57 = 557.48/x
3. Step 3: Cross multiply
   1,105.49x = 1,658.57 × 557.48
4. Step 4: Simplify right side
   1,105.49x = 924,608.52
5. Step 5: Solve for x
   x = 924,608.52/1,105.49
6. Step 6: Final answer
   x = 836.38