Finding the Fourth Proportional to 137,238.88, 205,688.76 and 81,022

Step by Step Solution

1. Step 1: Write the proportion equation
   137,238.88 : 205,688.76 = 81,022 : x
2. Step 2: Convert to fraction form
   137,238.88/205,688.76 = 81,022/x
3. Step 3: Cross multiply
   137,238.88x = 205,688.76 × 81,022
4. Step 4: Simplify right side
   137,238.88x = 16,665,314,712.72
5. Step 5: Solve for x
   x = 16,665,314,712.72/137,238.88
6. Step 6: Final answer
   x = 121,432.90