Finding the Third Proportional to 99.31 and 213.04

Step by Step Solution

1. Step 1: Write the proportion equation
   99.31 : 213.04 = 213.04 : x
2. Step 2: Convert to fraction form
   99.31/213.04 = 213.04/x
3. Step 3: Cross multiply
   99.31x = 213.04 × 213.04
4. Step 4: Simplify right side
   99.31x = 45,386.16
5. Step 5: Solve for x
   x = 45,386.16/99.31
6. Step 6: Final answer
   x = 457.01