Finding the Fourth Proportional to 89,931.21, 123,989.77 and 73,738.90

Step by Step Solution

1. Step 1: Write the proportion equation
   89,931.21 : 123,989.77 = 73,738.90 : x
2. Step 2: Convert to fraction form
   89,931.21/123,989.77 = 73,738.90/x
3. Step 3: Cross multiply
   89,931.21x = 123,989.77 × 73,738.90
4. Step 4: Simplify right side
   89,931.21x = 9,142,868,882.36
5. Step 5: Solve for x
   x = 9,142,868,882.36/89,931.21
6. Step 6: Final answer
   x = 101,665.14