Finding the Fourth Proportional to 91.34, 136.71 and 74.17

Step by Step Solution

1. Step 1: Write the proportion equation
   91.34 : 136.71 = 74.17 : x
2. Step 2: Convert to fraction form
   91.34/136.71 = 74.17/x
3. Step 3: Cross multiply
   91.34x = 136.71 × 74.17
4. Step 4: Simplify right side
   91.34x = 10,139.10
5. Step 5: Solve for x
   x = 10,139.10/91.34
6. Step 6: Final answer
   x = 111.00