Finding the Third Proportional to 99,989.50 and 140,628

Step by Step Solution

1. Step 1: Write the proportion equation
   99,989.50 : 140,628 = 140,628 : x
2. Step 2: Convert to fraction form
   99,989.50/140,628 = 140,628/x
3. Step 3: Cross multiply
   99,989.50x = 140,628 × 140,628
4. Step 4: Simplify right side
   99,989.50x = 19,776,234,384
5. Step 5: Solve for x
   x = 19,776,234,384/99,989.50
6. Step 6: Final answer
   x = 197,783.11