Finding the Fourth Proportional to 72.48, 109.32 and 69.12

Step by Step Solution

1. Step 1: Write the proportion equation
   72.48 : 109.32 = 69.12 : x
2. Step 2: Convert to fraction form
   72.48/109.32 = 69.12/x
3. Step 3: Cross multiply
   72.48x = 109.32 × 69.12
4. Step 4: Simplify right side
   72.48x = 7,556.20
5. Step 5: Solve for x
   x = 7,556.20/72.48
6. Step 6: Final answer
   x = 104.25