Finding the Third Proportional to 90,639.50 and 140,059

Step by Step Solution

1. Step 1: Write the proportion equation
   90,639.50 : 140,059 = 140,059 : x
2. Step 2: Convert to fraction form
   90,639.50/140,059 = 140,059/x
3. Step 3: Cross multiply
   90,639.50x = 140,059 × 140,059
4. Step 4: Simplify right side
   90,639.50x = 19,616,523,481
5. Step 5: Solve for x
   x = 19,616,523,481/90,639.50
6. Step 6: Final answer
   x = 216,423.56