Finding the Fourth Proportional to 91.89, 126.73 and 59.15

Step by Step Solution

1. Step 1: Write the proportion equation
   91.89 : 126.73 = 59.15 : x
2. Step 2: Convert to fraction form
   91.89/126.73 = 59.15/x
3. Step 3: Cross multiply
   91.89x = 126.73 × 59.15
4. Step 4: Simplify right side
   91.89x = 7,496.47
5. Step 5: Solve for x
   x = 7,496.47/91.89
6. Step 6: Final answer
   x = 81.58