Finding the Fourth Proportional to 72.55, 109.25 and 64.50

Step by Step Solution

1. Step 1: Write the proportion equation
   72.55 : 109.25 = 64.50 : x
2. Step 2: Convert to fraction form
   72.55/109.25 = 64.50/x
3. Step 3: Cross multiply
   72.55x = 109.25 × 64.50
4. Step 4: Simplify right side
   72.55x = 7,046.13
5. Step 5: Solve for x
   x = 7,046.13/72.55
6. Step 6: Final answer
   x = 97.13