Finding the Fourth Proportional to 91.56, 136.69 and 76.98

Step by Step Solution

1. Step 1: Write the proportion equation
   91.56 : 136.69 = 76.98 : x
2. Step 2: Convert to fraction form
   91.56/136.69 = 76.98/x
3. Step 3: Cross multiply
   91.56x = 136.69 × 76.98
4. Step 4: Simplify right side
   91.56x = 10,522.40
5. Step 5: Solve for x
   x = 10,522.40/91.56
6. Step 6: Final answer
   x = 114.92