Finding the Fourth Proportional to 8,451.96, 12,678.42 and 2,212.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,451.96 : 12,678.42 = 2,212.20 : x
2. Step 2: Convert to fraction form
   8,451.96/12,678.42 = 2,212.20/x
3. Step 3: Cross multiply
   8,451.96x = 12,678.42 × 2,212.20
4. Step 4: Simplify right side
   8,451.96x = 28,047,200.72
5. Step 5: Solve for x
   x = 28,047,200.72/8,451.96
6. Step 6: Final answer
   x = 3,318.43