Finding the Fourth Proportional to 8,423.47, 12,629.15 and 3,978.67

Step by Step Solution

1. Step 1: Write the proportion equation
   8,423.47 : 12,629.15 = 3,978.67 : x
2. Step 2: Convert to fraction form
   8,423.47/12,629.15 = 3,978.67/x
3. Step 3: Cross multiply
   8,423.47x = 12,629.15 × 3,978.67
4. Step 4: Simplify right side
   8,423.47x = 50,247,200.34
5. Step 5: Solve for x
   x = 50,247,200.34/8,423.47
6. Step 6: Final answer
   x = 5,965.14