Finding the Fourth Proportional to 124,921.32, 172,342.98 and 79,591.20

Step by Step Solution

1. Step 1: Write the proportion equation
   124,921.32 : 172,342.98 = 79,591.20 : x
2. Step 2: Convert to fraction form
   124,921.32/172,342.98 = 79,591.20/x
3. Step 3: Cross multiply
   124,921.32x = 172,342.98 × 79,591.20
4. Step 4: Simplify right side
   124,921.32x = 13,716,984,589.78
5. Step 5: Solve for x
   x = 13,716,984,589.78/124,921.32
6. Step 6: Final answer
   x = 109,804.99