Finding the Fourth Proportional to 315,009.02, 472,710.18 and 128,020.52

Step by Step Solution

1. Step 1: Write the proportion equation
   315,009.02 : 472,710.18 = 128,020.52 : x
2. Step 2: Convert to fraction form
   315,009.02/472,710.18 = 128,020.52/x
3. Step 3: Cross multiply
   315,009.02x = 472,710.18 × 128,020.52
4. Step 4: Simplify right side
   315,009.02x = 60,516,603,052.89
5. Step 5: Solve for x
   x = 60,516,603,052.89/315,009.02
6. Step 6: Final answer
   x = 192,110.70