Finding the Fourth Proportional to 67.65, 101.31 and 53.10

Step by Step Solution

1. Step 1: Write the proportion equation
   67.65 : 101.31 = 53.10 : x
2. Step 2: Convert to fraction form
   67.65/101.31 = 53.10/x
3. Step 3: Cross multiply
   67.65x = 101.31 × 53.10
4. Step 4: Simplify right side
   67.65x = 5,379.56
5. Step 5: Solve for x
   x = 5,379.56/67.65
6. Step 6: Final answer
   x = 79.52