Finding the Fourth Proportional to 1,105.06, 1,657.38 and 557.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.06 : 1,657.38 = 557.40 : x
2. Step 2: Convert to fraction form
   1,105.06/1,657.38 = 557.40/x
3. Step 3: Cross multiply
   1,105.06x = 1,657.38 × 557.40
4. Step 4: Simplify right side
   1,105.06x = 923,823.61
5. Step 5: Solve for x
   x = 923,823.61/1,105.06
6. Step 6: Final answer
   x = 835.99