Finding the Fourth Proportional to 37.98, 52.42 and 30.72

Step by Step Solution

1. Step 1: Write the proportion equation
   37.98 : 52.42 = 30.72 : x
2. Step 2: Convert to fraction form
   37.98/52.42 = 30.72/x
3. Step 3: Cross multiply
   37.98x = 52.42 × 30.72
4. Step 4: Simplify right side
   37.98x = 1,610.34
5. Step 5: Solve for x
   x = 1,610.34/37.98
6. Step 6: Final answer
   x = 42.40