Finding the Third Proportional to 138.94 and 248.72

Step by Step Solution

1. Step 1: Write the proportion equation
   138.94 : 248.72 = 248.72 : x
2. Step 2: Convert to fraction form
   138.94/248.72 = 248.72/x
3. Step 3: Cross multiply
   138.94x = 248.72 × 248.72
4. Step 4: Simplify right side
   138.94x = 61,861.02
5. Step 5: Solve for x
   x = 61,861.02/138.94
6. Step 6: Final answer
   x = 445.24