Finding the Fourth Proportional to 89,851.28, 123,916.01 and 71,939.75

Step by Step Solution

1. Step 1: Write the proportion equation
   89,851.28 : 123,916.01 = 71,939.75 : x
2. Step 2: Convert to fraction form
   89,851.28/123,916.01 = 71,939.75/x
3. Step 3: Cross multiply
   89,851.28x = 123,916.01 × 71,939.75
4. Step 4: Simplify right side
   89,851.28x = 8,914,485,801.12
5. Step 5: Solve for x
   x = 8,914,485,801.12/89,851.28
6. Step 6: Final answer
   x = 99,213.79