Finding the Fourth Proportional to 72.74, 108.69 and 56.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72.74 : 108.69 = 56.72 : x
2. Step 2: Convert to fraction form
   72.74/108.69 = 56.72/x
3. Step 3: Cross multiply
   72.74x = 108.69 × 56.72
4. Step 4: Simplify right side
   72.74x = 6,164.61
5. Step 5: Solve for x
   x = 6,164.61/72.74
6. Step 6: Final answer
   x = 84.75