Finding the Third Proportional to 90.06 and 139.94

Step by Step Solution

1. Step 1: Write the proportion equation
   90.06 : 139.94 = 139.94 : x
2. Step 2: Convert to fraction form
   90.06/139.94 = 139.94/x
3. Step 3: Cross multiply
   90.06x = 139.94 × 139.94
4. Step 4: Simplify right side
   90.06x = 19,582.50
5. Step 5: Solve for x
   x = 19,582.50/90.06
6. Step 6: Final answer
   x = 217.43