Finding the Fourth Proportional to 172,439.28, 258,505.43 and 67,234.05

Step by Step Solution

1. Step 1: Write the proportion equation
   172,439.28 : 258,505.43 = 67,234.05 : x
2. Step 2: Convert to fraction form
   172,439.28/258,505.43 = 67,234.05/x
3. Step 3: Cross multiply
   172,439.28x = 258,505.43 × 67,234.05
4. Step 4: Simplify right side
   172,439.28x = 17,380,366,669.72
5. Step 5: Solve for x
   x = 17,380,366,669.72/172,439.28
6. Step 6: Final answer
   x = 100,791.23