Finding the Fourth Proportional to 72.50, 108.60 and 43.61

Step by Step Solution

1. Step 1: Write the proportion equation
   72.50 : 108.60 = 43.61 : x
2. Step 2: Convert to fraction form
   72.50/108.60 = 43.61/x
3. Step 3: Cross multiply
   72.50x = 108.60 × 43.61
4. Step 4: Simplify right side
   72.50x = 4,736.38
5. Step 5: Solve for x
   x = 4,736.38/72.50
6. Step 6: Final answer
   x = 65.33