Finding the Fourth Proportional to 91.81, 137.76 and 37.72

Step by Step Solution

1. Step 1: Write the proportion equation
   91.81 : 137.76 = 37.72 : x
2. Step 2: Convert to fraction form
   91.81/137.76 = 37.72/x
3. Step 3: Cross multiply
   91.81x = 137.76 × 37.72
4. Step 4: Simplify right side
   91.81x = 5,196.31
5. Step 5: Solve for x
   x = 5,196.31/91.81
6. Step 6: Final answer
   x = 56.60