Finding the Third Proportional to 90,436.50 and 137,760.75

Step by Step Solution

1. Step 1: Write the proportion equation
   90,436.50 : 137,760.75 = 137,760.75 : x
2. Step 2: Convert to fraction form
   90,436.50/137,760.75 = 137,760.75/x
3. Step 3: Cross multiply
   90,436.50x = 137,760.75 × 137,760.75
4. Step 4: Simplify right side
   90,436.50x = 18,978,024,240.56
5. Step 5: Solve for x
   x = 18,978,024,240.56/90,436.50
6. Step 6: Final answer
   x = 209,849.17