Finding the Fourth Proportional to 76.34, 104.72 and 72.20

Step by Step Solution

1. Step 1: Write the proportion equation
   76.34 : 104.72 = 72.20 : x
2. Step 2: Convert to fraction form
   76.34/104.72 = 72.20/x
3. Step 3: Cross multiply
   76.34x = 104.72 × 72.20
4. Step 4: Simplify right side
   76.34x = 7,560.78
5. Step 5: Solve for x
   x = 7,560.78/76.34
6. Step 6: Final answer
   x = 99.04