Finding the Fourth Proportional to 91.59, 137.37 and 30.72

Step by Step Solution

1. Step 1: Write the proportion equation
   91.59 : 137.37 = 30.72 : x
2. Step 2: Convert to fraction form
   91.59/137.37 = 30.72/x
3. Step 3: Cross multiply
   91.59x = 137.37 × 30.72
4. Step 4: Simplify right side
   91.59x = 4,219.85
5. Step 5: Solve for x
   x = 4,219.85/91.59
6. Step 6: Final answer
   x = 46.07