Finding the Third Proportional to 99.31 and 213.75

Step by Step Solution

1. Step 1: Write the proportion equation
   99.31 : 213.75 = 213.75 : x
2. Step 2: Convert to fraction form
   99.31/213.75 = 213.75/x
3. Step 3: Cross multiply
   99.31x = 213.75 × 213.75
4. Step 4: Simplify right side
   99.31x = 45,690.00
5. Step 5: Solve for x
   x = 45,690.00/99.31
6. Step 6: Final answer
   x = 460.07