Finding the Fourth Proportional to 149,499.20, 206,358.89 and 89,088.80

Step by Step Solution

1. Step 1: Write the proportion equation
   149,499.20 : 206,358.89 = 89,088.80 : x
2. Step 2: Convert to fraction form
   149,499.20/206,358.89 = 89,088.80/x
3. Step 3: Cross multiply
   149,499.20x = 206,358.89 × 89,088.80
4. Step 4: Simplify right side
   149,499.20x = 18,384,264,903.32
5. Step 5: Solve for x
   x = 18,384,264,903.32/149,499.20
6. Step 6: Final answer
   x = 122,972.33