Finding the Fourth Proportional to 46.72, 69.72 and 42.16

Step by Step Solution

1. Step 1: Write the proportion equation
   46.72 : 69.72 = 42.16 : x
2. Step 2: Convert to fraction form
   46.72/69.72 = 42.16/x
3. Step 3: Cross multiply
   46.72x = 69.72 × 42.16
4. Step 4: Simplify right side
   46.72x = 2,939.40
5. Step 5: Solve for x
   x = 2,939.40/46.72
6. Step 6: Final answer
   x = 62.92