Finding the Third Proportional to 99,016.31 and 212,959.69

Step by Step Solution

1. Step 1: Write the proportion equation
   99,016.31 : 212,959.69 = 212,959.69 : x
2. Step 2: Convert to fraction form
   99,016.31/212,959.69 = 212,959.69/x
3. Step 3: Cross multiply
   99,016.31x = 212,959.69 × 212,959.69
4. Step 4: Simplify right side
   99,016.31x = 45,351,828,500.10
5. Step 5: Solve for x
   x = 45,351,828,500.10/99,016.31
6. Step 6: Final answer
   x = 458,023.81