Finding the Fourth Proportional to 315,061.30, 472,469.10 and 137,447.20

Step by Step Solution

1. Step 1: Write the proportion equation
   315,061.30 : 472,469.10 = 137,447.20 : x
2. Step 2: Convert to fraction form
   315,061.30/472,469.10 = 137,447.20/x
3. Step 3: Cross multiply
   315,061.30x = 472,469.10 × 137,447.20
4. Step 4: Simplify right side
   315,061.30x = 64,939,554,881.52
5. Step 5: Solve for x
   x = 64,939,554,881.52/315,061.30
6. Step 6: Final answer
   x = 206,117.21