Finding the Fourth Proportional to 131,728, 181,789.20 and 72,112

Step by Step Solution

1. Step 1: Write the proportion equation
   131,728 : 181,789.20 = 72,112 : x
2. Step 2: Convert to fraction form
   131,728/181,789.20 = 72,112/x
3. Step 3: Cross multiply
   131,728x = 181,789.20 × 72,112
4. Step 4: Simplify right side
   131,728x = 13,109,182,790.40
5. Step 5: Solve for x
   x = 13,109,182,790.40/131,728
6. Step 6: Final answer
   x = 99,517.06