Finding the Third Proportional to 99,909 and 140,709.38

Step by Step Solution

1. Step 1: Write the proportion equation
   99,909 : 140,709.38 = 140,709.38 : x
2. Step 2: Convert to fraction form
   99,909/140,709.38 = 140,709.38/x
3. Step 3: Cross multiply
   99,909x = 140,709.38 × 140,709.38
4. Step 4: Simplify right side
   99,909x = 19,799,128,212.89
5. Step 5: Solve for x
   x = 19,799,128,212.89/99,909
6. Step 6: Final answer
   x = 198,171.62