Finding the Fourth Proportional to 42.36, 58.50 and 38.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42.36 : 58.50 = 38.72 : x
2. Step 2: Convert to fraction form
   42.36/58.50 = 38.72/x
3. Step 3: Cross multiply
   42.36x = 58.50 × 38.72
4. Step 4: Simplify right side
   42.36x = 2,264.83
5. Step 5: Solve for x
   x = 2,264.83/42.36
6. Step 6: Final answer
   x = 53.47