Finding the Fourth Proportional to 1,111.92, 1,666.72 and 557.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.92 : 1,666.72 = 557.07 : x
2. Step 2: Convert to fraction form
   1,111.92/1,666.72 = 557.07/x
3. Step 3: Cross multiply
   1,111.92x = 1,666.72 × 557.07
4. Step 4: Simplify right side
   1,111.92x = 928,479.71
5. Step 5: Solve for x
   x = 928,479.71/1,111.92
6. Step 6: Final answer
   x = 835.02