Finding the Fourth Proportional to 75.72, 104.76 and 72.72

Step by Step Solution

1. Step 1: Write the proportion equation
   75.72 : 104.76 = 72.72 : x
2. Step 2: Convert to fraction form
   75.72/104.76 = 72.72/x
3. Step 3: Cross multiply
   75.72x = 104.76 × 72.72
4. Step 4: Simplify right side
   75.72x = 7,618.15
5. Step 5: Solve for x
   x = 7,618.15/75.72
6. Step 6: Final answer
   x = 100.61