Finding the Fourth Proportional to 56.88, 78.42 and 38.42

Step by Step Solution

1. Step 1: Write the proportion equation
   56.88 : 78.42 = 38.42 : x
2. Step 2: Convert to fraction form
   56.88/78.42 = 38.42/x
3. Step 3: Cross multiply
   56.88x = 78.42 × 38.42
4. Step 4: Simplify right side
   56.88x = 3,012.90
5. Step 5: Solve for x
   x = 3,012.90/56.88
6. Step 6: Final answer
   x = 52.97