Finding the Fourth Proportional to 91.92, 137.72 and 57.59

Step by Step Solution

1. Step 1: Write the proportion equation
   91.92 : 137.72 = 57.59 : x
2. Step 2: Convert to fraction form
   91.92/137.72 = 57.59/x
3. Step 3: Cross multiply
   91.92x = 137.72 × 57.59
4. Step 4: Simplify right side
   91.92x = 7,931.78
5. Step 5: Solve for x
   x = 7,931.78/91.92
6. Step 6: Final answer
   x = 86.29