Finding the Fourth Proportional to 9,920.21, 14,874.31 and 3,909.09

Step by Step Solution

1. Step 1: Write the proportion equation
   9,920.21 : 14,874.31 = 3,909.09 : x
2. Step 2: Convert to fraction form
   9,920.21/14,874.31 = 3,909.09/x
3. Step 3: Cross multiply
   9,920.21x = 14,874.31 × 3,909.09
4. Step 4: Simplify right side
   9,920.21x = 58,145,016.48
5. Step 5: Solve for x
   x = 58,145,016.48/9,920.21
6. Step 6: Final answer
   x = 5,861.27