Finding the Fourth Proportional to 91.69, 137.49 and 42.91

Step by Step Solution

1. Step 1: Write the proportion equation
   91.69 : 137.49 = 42.91 : x
2. Step 2: Convert to fraction form
   91.69/137.49 = 42.91/x
3. Step 3: Cross multiply
   91.69x = 137.49 × 42.91
4. Step 4: Simplify right side
   91.69x = 5,899.70
5. Step 5: Solve for x
   x = 5,899.70/91.69
6. Step 6: Final answer
   x = 64.34