Finding the Fourth Proportional to 91.50, 136.96 and 57.34

Step by Step Solution

1. Step 1: Write the proportion equation
   91.50 : 136.96 = 57.34 : x
2. Step 2: Convert to fraction form
   91.50/136.96 = 57.34/x
3. Step 3: Cross multiply
   91.50x = 136.96 × 57.34
4. Step 4: Simplify right side
   91.50x = 7,853.31
5. Step 5: Solve for x
   x = 7,853.31/91.50
6. Step 6: Final answer
   x = 85.83