Finding the Fourth Proportional to 10,929.60, 16,401.42 and 4,271.40

Step by Step Solution

1. Step 1: Write the proportion equation
   10,929.60 : 16,401.42 = 4,271.40 : x
2. Step 2: Convert to fraction form
   10,929.60/16,401.42 = 4,271.40/x
3. Step 3: Cross multiply
   10,929.60x = 16,401.42 × 4,271.40
4. Step 4: Simplify right side
   10,929.60x = 70,057,025.39
5. Step 5: Solve for x
   x = 70,057,025.39/10,929.60
6. Step 6: Final answer
   x = 6,409.84