Finding the Third Proportional to 99,394.59 and 207,172.69

Step by Step Solution

1. Step 1: Write the proportion equation
   99,394.59 : 207,172.69 = 207,172.69 : x
2. Step 2: Convert to fraction form
   99,394.59/207,172.69 = 207,172.69/x
3. Step 3: Cross multiply
   99,394.59x = 207,172.69 × 207,172.69
4. Step 4: Simplify right side
   99,394.59x = 42,920,522,445.97
5. Step 5: Solve for x
   x = 42,920,522,445.97/99,394.59
6. Step 6: Final answer
   x = 431,819.49