Finding the Fourth Proportional to 91.76, 126.43 and 83.59

Step by Step Solution

1. Step 1: Write the proportion equation
   91.76 : 126.43 = 83.59 : x
2. Step 2: Convert to fraction form
   91.76/126.43 = 83.59/x
3. Step 3: Cross multiply
   91.76x = 126.43 × 83.59
4. Step 4: Simplify right side
   91.76x = 10,567.76
5. Step 5: Solve for x
   x = 10,567.76/91.76
6. Step 6: Final answer
   x = 115.17