Finding the Third Proportional to 20.31 and 42.94

Step by Step Solution

1. Step 1: Write the proportion equation
   20.31 : 42.94 = 42.94 : x
2. Step 2: Convert to fraction form
   20.31/42.94 = 42.94/x
3. Step 3: Cross multiply
   20.31x = 42.94 × 42.94
4. Step 4: Simplify right side
   20.31x = 1,843.63
5. Step 5: Solve for x
   x = 1,843.63/20.31
6. Step 6: Final answer
   x = 90.76