Finding the Fourth Proportional to 149,559.50, 206,384.82 and 89,128.76

Step by Step Solution

1. Step 1: Write the proportion equation
   149,559.50 : 206,384.82 = 89,128.76 : x
2. Step 2: Convert to fraction form
   149,559.50/206,384.82 = 89,128.76/x
3. Step 3: Cross multiply
   149,559.50x = 206,384.82 × 89,128.76
4. Step 4: Simplify right side
   149,559.50x = 18,394,823,089.42
5. Step 5: Solve for x
   x = 18,394,823,089.42/149,559.50
6. Step 6: Final answer
   x = 122,993.34