Finding the Fourth Proportional to 1,105.50, 1,657.02 and 558.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.50 : 1,657.02 = 558.18 : x
2. Step 2: Convert to fraction form
   1,105.50/1,657.02 = 558.18/x
3. Step 3: Cross multiply
   1,105.50x = 1,657.02 × 558.18
4. Step 4: Simplify right side
   1,105.50x = 924,915.42
5. Step 5: Solve for x
   x = 924,915.42/1,105.50
6. Step 6: Final answer
   x = 836.65