Finding the Third Proportional to 66.56 and 139.94

Step by Step Solution

1. Step 1: Write the proportion equation
   66.56 : 139.94 = 139.94 : x
2. Step 2: Convert to fraction form
   66.56/139.94 = 139.94/x
3. Step 3: Cross multiply
   66.56x = 139.94 × 139.94
4. Step 4: Simplify right side
   66.56x = 19,582.50
5. Step 5: Solve for x
   x = 19,582.50/66.56
6. Step 6: Final answer
   x = 294.20