Finding the Fourth Proportional to 329,820.48, 494,766.54 and 105,128.10

Step by Step Solution

1. Step 1: Write the proportion equation
   329,820.48 : 494,766.54 = 105,128.10 : x
2. Step 2: Convert to fraction form
   329,820.48/494,766.54 = 105,128.10/x
3. Step 3: Cross multiply
   329,820.48x = 494,766.54 × 105,128.10
4. Step 4: Simplify right side
   329,820.48x = 52,013,866,293.77
5. Step 5: Solve for x
   x = 52,013,866,293.77/329,820.48
6. Step 6: Final answer
   x = 157,703.57