Finding the Fourth Proportional to 76.48, 105.61 and 53.22

Step by Step Solution

1. Step 1: Write the proportion equation
   76.48 : 105.61 = 53.22 : x
2. Step 2: Convert to fraction form
   76.48/105.61 = 53.22/x
3. Step 3: Cross multiply
   76.48x = 105.61 × 53.22
4. Step 4: Simplify right side
   76.48x = 5,620.56
5. Step 5: Solve for x
   x = 5,620.56/76.48
6. Step 6: Final answer
   x = 73.49