Finding the Fourth Proportional to 300.72, 414.72 and 212.16

Step by Step Solution

1. Step 1: Write the proportion equation
   300.72 : 414.72 = 212.16 : x
2. Step 2: Convert to fraction form
   300.72/414.72 = 212.16/x
3. Step 3: Cross multiply
   300.72x = 414.72 × 212.16
4. Step 4: Simplify right side
   300.72x = 87,987.00
5. Step 5: Solve for x
   x = 87,987.00/300.72
6. Step 6: Final answer
   x = 292.59