Finding the Third Proportional to 89,036.50 and 138,661

Step by Step Solution

1. Step 1: Write the proportion equation
   89,036.50 : 138,661 = 138,661 : x
2. Step 2: Convert to fraction form
   89,036.50/138,661 = 138,661/x
3. Step 3: Cross multiply
   89,036.50x = 138,661 × 138,661
4. Step 4: Simplify right side
   89,036.50x = 19,226,872,921
5. Step 5: Solve for x
   x = 19,226,872,921/89,036.50
6. Step 6: Final answer
   x = 215,943.72