Finding the Fourth Proportional to 318,055.30, 438,919.72 and 172,861.10

Step by Step Solution

1. Step 1: Write the proportion equation
   318,055.30 : 438,919.72 = 172,861.10 : x
2. Step 2: Convert to fraction form
   318,055.30/438,919.72 = 172,861.10/x
3. Step 3: Cross multiply
   318,055.30x = 438,919.72 × 172,861.10
4. Step 4: Simplify right side
   318,055.30x = 75,872,145,610.89
5. Step 5: Solve for x
   x = 75,872,145,610.89/318,055.30
6. Step 6: Final answer
   x = 238,550.17