Finding the Third Proportional to 40.99 and 72.07

Step by Step Solution

1. Step 1: Write the proportion equation
   40.99 : 72.07 = 72.07 : x
2. Step 2: Convert to fraction form
   40.99/72.07 = 72.07/x
3. Step 3: Cross multiply
   40.99x = 72.07 × 72.07
4. Step 4: Simplify right side
   40.99x = 5,194.13
5. Step 5: Solve for x
   x = 5,194.13/40.99
6. Step 6: Final answer
   x = 126.71