Finding the Fourth Proportional to 72.55, 108.86 and 43.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72.55 : 108.86 = 43.72 : x
2. Step 2: Convert to fraction form
   72.55/108.86 = 43.72/x
3. Step 3: Cross multiply
   72.55x = 108.86 × 43.72
4. Step 4: Simplify right side
   72.55x = 4,758.87
5. Step 5: Solve for x
   x = 4,758.87/72.55
6. Step 6: Final answer
   x = 65.60