Finding the Fourth Proportional to 8,423.22, 12,628.77 and 3,978.42

Step by Step Solution

1. Step 1: Write the proportion equation
   8,423.22 : 12,628.77 = 3,978.42 : x
2. Step 2: Convert to fraction form
   8,423.22/12,628.77 = 3,978.42/x
3. Step 3: Cross multiply
   8,423.22x = 12,628.77 × 3,978.42
4. Step 4: Simplify right side
   8,423.22x = 50,242,551.14
5. Step 5: Solve for x
   x = 50,242,551.14/8,423.22
6. Step 6: Final answer
   x = 5,964.77