Finding the Fourth Proportional to 72.56, 108.61 and 69.12

Step by Step Solution

1. Step 1: Write the proportion equation
   72.56 : 108.61 = 69.12 : x
2. Step 2: Convert to fraction form
   72.56/108.61 = 69.12/x
3. Step 3: Cross multiply
   72.56x = 108.61 × 69.12
4. Step 4: Simplify right side
   72.56x = 7,506.95
5. Step 5: Solve for x
   x = 7,506.95/72.56
6. Step 6: Final answer
   x = 103.45