Finding the Fourth Proportional to 128,061.43, 176,560.50 and 105,006.31

Step by Step Solution

1. Step 1: Write the proportion equation
   128,061.43 : 176,560.50 = 105,006.31 : x
2. Step 2: Convert to fraction form
   128,061.43/176,560.50 = 105,006.31/x
3. Step 3: Cross multiply
   128,061.43x = 176,560.50 × 105,006.31
4. Step 4: Simplify right side
   128,061.43x = 18,539,966,555.67
5. Step 5: Solve for x
   x = 18,539,966,555.67/128,061.43
6. Step 6: Final answer
   x = 144,774.01