Finding the Fourth Proportional to 315,696.72, 435,691.50 and 172,478.28

Step by Step Solution

1. Step 1: Write the proportion equation
   315,696.72 : 435,691.50 = 172,478.28 : x
2. Step 2: Convert to fraction form
   315,696.72/435,691.50 = 172,478.28/x
3. Step 3: Cross multiply
   315,696.72x = 435,691.50 × 172,478.28
4. Step 4: Simplify right side
   315,696.72x = 75,147,320,530.62
5. Step 5: Solve for x
   x = 75,147,320,530.62/315,696.72
6. Step 6: Final answer
   x = 238,036.43