Finding the Fourth Proportional to 91.91, 126.72 and 59.15

Step by Step Solution

1. Step 1: Write the proportion equation
   91.91 : 126.72 = 59.15 : x
2. Step 2: Convert to fraction form
   91.91/126.72 = 59.15/x
3. Step 3: Cross multiply
   91.91x = 126.72 × 59.15
4. Step 4: Simplify right side
   91.91x = 7,494.85
5. Step 5: Solve for x
   x = 7,494.85/91.91
6. Step 6: Final answer
   x = 81.55