Finding the Fourth Proportional to 45.43, 67.82 and 42.18

Step by Step Solution

1. Step 1: Write the proportion equation
   45.43 : 67.82 = 42.18 : x
2. Step 2: Convert to fraction form
   45.43/67.82 = 42.18/x
3. Step 3: Cross multiply
   45.43x = 67.82 × 42.18
4. Step 4: Simplify right side
   45.43x = 2,860.65
5. Step 5: Solve for x
   x = 2,860.65/45.43
6. Step 6: Final answer
   x = 62.97