Finding the Fourth Proportional to 82.72, 124.16 and 64.72

Step by Step Solution

1. Step 1: Write the proportion equation
   82.72 : 124.16 = 64.72 : x
2. Step 2: Convert to fraction form
   82.72/124.16 = 64.72/x
3. Step 3: Cross multiply
   82.72x = 124.16 × 64.72
4. Step 4: Simplify right side
   82.72x = 8,035.64
5. Step 5: Solve for x
   x = 8,035.64/82.72
6. Step 6: Final answer
   x = 97.14