Finding the Third Proportional to 99,298 and 212,810

Step by Step Solution

1. Step 1: Write the proportion equation
   99,298 : 212,810 = 212,810 : x
2. Step 2: Convert to fraction form
   99,298/212,810 = 212,810/x
3. Step 3: Cross multiply
   99,298x = 212,810 × 212,810
4. Step 4: Simplify right side
   99,298x = 45,288,096,100
5. Step 5: Solve for x
   x = 45,288,096,100/99,298
6. Step 6: Final answer
   x = 456,082.66