Finding the Fourth Proportional to 150,111, 207,153.99 and 82,128.78

Step by Step Solution

1. Step 1: Write the proportion equation
   150,111 : 207,153.99 = 82,128.78 : x
2. Step 2: Convert to fraction form
   150,111/207,153.99 = 82,128.78/x
3. Step 3: Cross multiply
   150,111x = 207,153.99 × 82,128.78
4. Step 4: Simplify right side
   150,111x = 17,013,304,470.83
5. Step 5: Solve for x
   x = 17,013,304,470.83/150,111
6. Step 6: Final answer
   x = 113,338.16