Finding the Fourth Proportional to 91.32, 136.98 and 37.21

Step by Step Solution

1. Step 1: Write the proportion equation
   91.32 : 136.98 = 37.21 : x
2. Step 2: Convert to fraction form
   91.32/136.98 = 37.21/x
3. Step 3: Cross multiply
   91.32x = 136.98 × 37.21
4. Step 4: Simplify right side
   91.32x = 5,096.34
5. Step 5: Solve for x
   x = 5,096.34/91.32
6. Step 6: Final answer
   x = 55.81