Finding the Fourth Proportional to 82.91, 114.52 and 64.72

Step by Step Solution

1. Step 1: Write the proportion equation
   82.91 : 114.52 = 64.72 : x
2. Step 2: Convert to fraction form
   82.91/114.52 = 64.72/x
3. Step 3: Cross multiply
   82.91x = 114.52 × 64.72
4. Step 4: Simplify right side
   82.91x = 7,411.73
5. Step 5: Solve for x
   x = 7,411.73/82.91
6. Step 6: Final answer
   x = 89.39