Finding the Third Proportional to 103.15 and 222.40

Step by Step Solution

1. Step 1: Write the proportion equation
   103.15 : 222.40 = 222.40 : x
2. Step 2: Convert to fraction form
   103.15/222.40 = 222.40/x
3. Step 3: Cross multiply
   103.15x = 222.40 × 222.40
4. Step 4: Simplify right side
   103.15x = 49,461.07
5. Step 5: Solve for x
   x = 49,461.07/103.15
6. Step 6: Final answer
   x = 479.51