Finding the Fourth Proportional to 1,106.31, 1,658.82 and 558.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,106.31 : 1,658.82 = 558.21 : x
2. Step 2: Convert to fraction form
   1,106.31/1,658.82 = 558.21/x
3. Step 3: Cross multiply
   1,106.31x = 1,658.82 × 558.21
4. Step 4: Simplify right side
   1,106.31x = 925,969.91
5. Step 5: Solve for x
   x = 925,969.91/1,106.31
6. Step 6: Final answer
   x = 836.99