Finding the Third Proportional to 139.88 and 243.94

Step by Step Solution

1. Step 1: Write the proportion equation
   139.88 : 243.94 = 243.94 : x
2. Step 2: Convert to fraction form
   139.88/243.94 = 243.94/x
3. Step 3: Cross multiply
   139.88x = 243.94 × 243.94
4. Step 4: Simplify right side
   139.88x = 59,505.50
5. Step 5: Solve for x
   x = 59,505.50/139.88
6. Step 6: Final answer
   x = 425.42