Finding the Fourth Proportional to 1,105.80, 1,657.17 and 558.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.80 : 1,657.17 = 558.34 : x
2. Step 2: Convert to fraction form
   1,105.80/1,657.17 = 558.34/x
3. Step 3: Cross multiply
   1,105.80x = 1,657.17 × 558.34
4. Step 4: Simplify right side
   1,105.80x = 925,264.30
5. Step 5: Solve for x
   x = 925,264.30/1,105.80
6. Step 6: Final answer
   x = 836.74