Finding the Third Proportional to 155.38 and 245.81

Step by Step Solution

1. Step 1: Write the proportion equation
   155.38 : 245.81 = 245.81 : x
2. Step 2: Convert to fraction form
   155.38/245.81 = 245.81/x
3. Step 3: Cross multiply
   155.38x = 245.81 × 245.81
4. Step 4: Simplify right side
   155.38x = 60,423.79
5. Step 5: Solve for x
   x = 60,423.79/155.38
6. Step 6: Final answer
   x = 388.89