Finding the Third Proportional to 42.13 and 99.31

Step by Step Solution

1. Step 1: Write the proportion equation
   42.13 : 99.31 = 99.31 : x
2. Step 2: Convert to fraction form
   42.13/99.31 = 99.31/x
3. Step 3: Cross multiply
   42.13x = 99.31 × 99.31
4. Step 4: Simplify right side
   42.13x = 9,862.97
5. Step 5: Solve for x
   x = 9,862.97/42.13
6. Step 6: Final answer
   x = 234.14