Finding the Fourth Proportional to 76.29, 105.31 and 53.05

Step by Step Solution

1. Step 1: Write the proportion equation
   76.29 : 105.31 = 53.05 : x
2. Step 2: Convert to fraction form
   76.29/105.31 = 53.05/x
3. Step 3: Cross multiply
   76.29x = 105.31 × 53.05
4. Step 4: Simplify right side
   76.29x = 5,586.56
5. Step 5: Solve for x
   x = 5,586.56/76.29
6. Step 6: Final answer
   x = 73.23