Finding the Third Proportional to 90.07 and 139.75

Step by Step Solution

1. Step 1: Write the proportion equation
   90.07 : 139.75 = 139.75 : x
2. Step 2: Convert to fraction form
   90.07/139.75 = 139.75/x
3. Step 3: Cross multiply
   90.07x = 139.75 × 139.75
4. Step 4: Simplify right side
   90.07x = 19,528.97
5. Step 5: Solve for x
   x = 19,528.97/90.07
6. Step 6: Final answer
   x = 216.82