Finding the Fourth Proportional to 72.64, 108.76 and 53.23

Step by Step Solution

1. Step 1: Write the proportion equation
   72.64 : 108.76 = 53.23 : x
2. Step 2: Convert to fraction form
   72.64/108.76 = 53.23/x
3. Step 3: Cross multiply
   72.64x = 108.76 × 53.23
4. Step 4: Simplify right side
   72.64x = 5,789.43
5. Step 5: Solve for x
   x = 5,789.43/72.64
6. Step 6: Final answer
   x = 79.70