Finding the Fourth Proportional to 59.34, 81.76 and 57.72

Step by Step Solution

1. Step 1: Write the proportion equation
   59.34 : 81.76 = 57.72 : x
2. Step 2: Convert to fraction form
   59.34/81.76 = 57.72/x
3. Step 3: Cross multiply
   59.34x = 81.76 × 57.72
4. Step 4: Simplify right side
   59.34x = 4,719.19
5. Step 5: Solve for x
   x = 4,719.19/59.34
6. Step 6: Final answer
   x = 79.53