Finding the Fourth Proportional to 1,105.72, 1,656.96 and 557.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.72 : 1,656.96 = 557.08 : x
2. Step 2: Convert to fraction form
   1,105.72/1,656.96 = 557.08/x
3. Step 3: Cross multiply
   1,105.72x = 1,656.96 × 557.08
4. Step 4: Simplify right side
   1,105.72x = 923,053.05
5. Step 5: Solve for x
   x = 923,053.05/1,105.72
6. Step 6: Final answer
   x = 834.80