Finding the Third Proportional to 109.69 and 247.78

Step by Step Solution

1. Step 1: Write the proportion equation
   109.69 : 247.78 = 247.78 : x
2. Step 2: Convert to fraction form
   109.69/247.78 = 247.78/x
3. Step 3: Cross multiply
   109.69x = 247.78 × 247.78
4. Step 4: Simplify right side
   109.69x = 61,395.55
5. Step 5: Solve for x
   x = 61,395.55/109.69
6. Step 6: Final answer
   x = 559.73