Finding the Fourth Proportional to 91.37, 137.04 and 42.57

Step by Step Solution

1. Step 1: Write the proportion equation
   91.37 : 137.04 = 42.57 : x
2. Step 2: Convert to fraction form
   91.37/137.04 = 42.57/x
3. Step 3: Cross multiply
   91.37x = 137.04 × 42.57
4. Step 4: Simplify right side
   91.37x = 5,833.63
5. Step 5: Solve for x
   x = 5,833.63/91.37
6. Step 6: Final answer
   x = 63.84