Finding the Fourth Proportional to 91.42, 137.14 and 43.31

Step by Step Solution

1. Step 1: Write the proportion equation
   91.42 : 137.14 = 43.31 : x
2. Step 2: Convert to fraction form
   91.42/137.14 = 43.31/x
3. Step 3: Cross multiply
   91.42x = 137.14 × 43.31
4. Step 4: Simplify right side
   91.42x = 5,939.77
5. Step 5: Solve for x
   x = 5,939.77/91.42
6. Step 6: Final answer
   x = 64.97