Finding the Fourth Proportional to 91.47, 137.18 and 42.06

Step by Step Solution

1. Step 1: Write the proportion equation
   91.47 : 137.18 = 42.06 : x
2. Step 2: Convert to fraction form
   91.47/137.18 = 42.06/x
3. Step 3: Cross multiply
   91.47x = 137.18 × 42.06
4. Step 4: Simplify right side
   91.47x = 5,769.79
5. Step 5: Solve for x
   x = 5,769.79/91.47
6. Step 6: Final answer
   x = 63.08