Finding the Fourth Proportional to 315,291.86, 435,112.02 and 172,061.15

Step by Step Solution

1. Step 1: Write the proportion equation
   315,291.86 : 435,112.02 = 172,061.15 : x
2. Step 2: Convert to fraction form
   315,291.86/435,112.02 = 172,061.15/x
3. Step 3: Cross multiply
   315,291.86x = 435,112.02 × 172,061.15
4. Step 4: Simplify right side
   315,291.86x = 74,865,872,364.46
5. Step 5: Solve for x
   x = 74,865,872,364.46/315,291.86
6. Step 6: Final answer
   x = 237,449.43