Finding the Fourth Proportional to 128,340.86, 177,074.15 and 76,651.83

Step by Step Solution

1. Step 1: Write the proportion equation
   128,340.86 : 177,074.15 = 76,651.83 : x
2. Step 2: Convert to fraction form
   128,340.86/177,074.15 = 76,651.83/x
3. Step 3: Cross multiply
   128,340.86x = 177,074.15 × 76,651.83
4. Step 4: Simplify right side
   128,340.86x = 13,573,057,259.94
5. Step 5: Solve for x
   x = 13,573,057,259.94/128,340.86
6. Step 6: Final answer
   x = 105,757.88