Finding the Fourth Proportional to 72.53, 108.78 and 43.22

Step by Step Solution

1. Step 1: Write the proportion equation
   72.53 : 108.78 = 43.22 : x
2. Step 2: Convert to fraction form
   72.53/108.78 = 43.22/x
3. Step 3: Cross multiply
   72.53x = 108.78 × 43.22
4. Step 4: Simplify right side
   72.53x = 4,701.47
5. Step 5: Solve for x
   x = 4,701.47/72.53
6. Step 6: Final answer
   x = 64.82