Finding the Fourth Proportional to 315,645.98, 435,588.57 and 172,405.98

Step by Step Solution

1. Step 1: Write the proportion equation
   315,645.98 : 435,588.57 = 172,405.98 : x
2. Step 2: Convert to fraction form
   315,645.98/435,588.57 = 172,405.98/x
3. Step 3: Cross multiply
   315,645.98x = 435,588.57 × 172,405.98
4. Step 4: Simplify right side
   315,645.98x = 75,098,074,287.65
5. Step 5: Solve for x
   x = 75,098,074,287.65/315,645.98
6. Step 6: Final answer
   x = 237,918.68