Finding the Fourth Proportional to 315,462.72, 435,344.82 and 172,223.30

Step by Step Solution

1. Step 1: Write the proportion equation
   315,462.72 : 435,344.82 = 172,223.30 : x
2. Step 2: Convert to fraction form
   315,462.72/435,344.82 = 172,223.30/x
3. Step 3: Cross multiply
   315,462.72x = 435,344.82 × 172,223.30
4. Step 4: Simplify right side
   315,462.72x = 74,976,521,538.31
5. Step 5: Solve for x
   x = 74,976,521,538.31/315,462.72
6. Step 6: Final answer
   x = 237,671.58