Finding the Fourth Proportional to 76.52, 105.48 and 53.18

Step by Step Solution

1. Step 1: Write the proportion equation
   76.52 : 105.48 = 53.18 : x
2. Step 2: Convert to fraction form
   76.52/105.48 = 53.18/x
3. Step 3: Cross multiply
   76.52x = 105.48 × 53.18
4. Step 4: Simplify right side
   76.52x = 5,609.43
5. Step 5: Solve for x
   x = 5,609.43/76.52
6. Step 6: Final answer
   x = 73.31