Finding the Fourth Proportional to 128,411.20, 177,212.82 and 79,363.72

Step by Step Solution

1. Step 1: Write the proportion equation
   128,411.20 : 177,212.82 = 79,363.72 : x
2. Step 2: Convert to fraction form
   128,411.20/177,212.82 = 79,363.72/x
3. Step 3: Cross multiply
   128,411.20x = 177,212.82 × 79,363.72
4. Step 4: Simplify right side
   128,411.20x = 14,064,268,626.89
5. Step 5: Solve for x
   x = 14,064,268,626.89/128,411.20
6. Step 6: Final answer
   x = 109,525.25