Finding the Fourth Proportional to 76.55, 104.82 and 72.39

Step by Step Solution

1. Step 1: Write the proportion equation
   76.55 : 104.82 = 72.39 : x
2. Step 2: Convert to fraction form
   76.55/104.82 = 72.39/x
3. Step 3: Cross multiply
   76.55x = 104.82 × 72.39
4. Step 4: Simplify right side
   76.55x = 7,587.40
5. Step 5: Solve for x
   x = 7,587.40/76.55
6. Step 6: Final answer
   x = 99.12