Finding the Fourth Proportional to 91.21, 136.82 and 37.15

Step by Step Solution

1. Step 1: Write the proportion equation
   91.21 : 136.82 = 37.15 : x
2. Step 2: Convert to fraction form
   91.21/136.82 = 37.15/x
3. Step 3: Cross multiply
   91.21x = 136.82 × 37.15
4. Step 4: Simplify right side
   91.21x = 5,082.86
5. Step 5: Solve for x
   x = 5,082.86/91.21
6. Step 6: Final answer
   x = 55.73