Finding the Fourth Proportional to 82.91, 114.59 and 64.47

Step by Step Solution

1. Step 1: Write the proportion equation
   82.91 : 114.59 = 64.47 : x
2. Step 2: Convert to fraction form
   82.91/114.59 = 64.47/x
3. Step 3: Cross multiply
   82.91x = 114.59 × 64.47
4. Step 4: Simplify right side
   82.91x = 7,387.29
5. Step 5: Solve for x
   x = 7,387.29/82.91
6. Step 6: Final answer
   x = 89.10