Finding the Fourth Proportional to 69.05, 103.47 and 52.78

Step by Step Solution

1. Step 1: Write the proportion equation
   69.05 : 103.47 = 52.78 : x
2. Step 2: Convert to fraction form
   69.05/103.47 = 52.78/x
3. Step 3: Cross multiply
   69.05x = 103.47 × 52.78
4. Step 4: Simplify right side
   69.05x = 5,461.15
5. Step 5: Solve for x
   x = 5,461.15/69.05
6. Step 6: Final answer
   x = 79.09