Finding the Fourth Proportional to 124,979.50, 172,471.72 and 68,390.88

Step by Step Solution

1. Step 1: Write the proportion equation
   124,979.50 : 172,471.72 = 68,390.88 : x
2. Step 2: Convert to fraction form
   124,979.50/172,471.72 = 68,390.88/x
3. Step 3: Cross multiply
   124,979.50x = 172,471.72 × 68,390.88
4. Step 4: Simplify right side
   124,979.50x = 11,795,491,672.58
5. Step 5: Solve for x
   x = 11,795,491,672.58/124,979.50
6. Step 6: Final answer
   x = 94,379.42