Finding the Fourth Proportional to 76.60, 114.72 and 42.27

Step by Step Solution

1. Step 1: Write the proportion equation
   76.60 : 114.72 = 42.27 : x
2. Step 2: Convert to fraction form
   76.60/114.72 = 42.27/x
3. Step 3: Cross multiply
   76.60x = 114.72 × 42.27
4. Step 4: Simplify right side
   76.60x = 4,849.27
5. Step 5: Solve for x
   x = 4,849.27/76.60
6. Step 6: Final answer
   x = 63.31