Finding the Fourth Proportional to 72.43, 108.78 and 69.53

Step by Step Solution

1. Step 1: Write the proportion equation
   72.43 : 108.78 = 69.53 : x
2. Step 2: Convert to fraction form
   72.43/108.78 = 69.53/x
3. Step 3: Cross multiply
   72.43x = 108.78 × 69.53
4. Step 4: Simplify right side
   72.43x = 7,563.47
5. Step 5: Solve for x
   x = 7,563.47/72.43
6. Step 6: Final answer
   x = 104.42