Finding the Fourth Proportional to 100,382.63, 138,591.83 and 89,608.62

Step by Step Solution

1. Step 1: Write the proportion equation
   100,382.63 : 138,591.83 = 89,608.62 : x
2. Step 2: Convert to fraction form
   100,382.63/138,591.83 = 89,608.62/x
3. Step 3: Cross multiply
   100,382.63x = 138,591.83 × 89,608.62
4. Step 4: Simplify right side
   100,382.63x = 12,419,022,853.60
5. Step 5: Solve for x
   x = 12,419,022,853.60/100,382.63
6. Step 6: Final answer
   x = 123,716.85