Finding the Fourth Proportional to 315,581.31, 435,499.28 and 172,340.91

Step by Step Solution

1. Step 1: Write the proportion equation
   315,581.31 : 435,499.28 = 172,340.91 : x
2. Step 2: Convert to fraction form
   315,581.31/435,499.28 = 172,340.91/x
3. Step 3: Cross multiply
   315,581.31x = 435,499.28 × 172,340.91
4. Step 4: Simplify right side
   315,581.31x = 75,054,341,357.84
5. Step 5: Solve for x
   x = 75,054,341,357.84/315,581.31
6. Step 6: Final answer
   x = 237,828.85