Finding the Fourth Proportional to 72.88, 109.38 and 64.82

Step by Step Solution

1. Step 1: Write the proportion equation
   72.88 : 109.38 = 64.82 : x
2. Step 2: Convert to fraction form
   72.88/109.38 = 64.82/x
3. Step 3: Cross multiply
   72.88x = 109.38 × 64.82
4. Step 4: Simplify right side
   72.88x = 7,090.01
5. Step 5: Solve for x
   x = 7,090.01/72.88
6. Step 6: Final answer
   x = 97.28