Finding the Fourth Proportional to 315,926.94, 435,978.15 and 172,687.02

Step by Step Solution

1. Step 1: Write the proportion equation
   315,926.94 : 435,978.15 = 172,687.02 : x
2. Step 2: Convert to fraction form
   315,926.94/435,978.15 = 172,687.02/x
3. Step 3: Cross multiply
   315,926.94x = 435,978.15 × 172,687.02
4. Step 4: Simplify right side
   315,926.94x = 75,287,767,508.61
5. Step 5: Solve for x
   x = 75,287,767,508.61/315,926.94
6. Step 6: Final answer
   x = 238,307.53