Finding the Fourth Proportional to 9,919.21, 14,872.81 and 3,908.09

Step by Step Solution

1. Step 1: Write the proportion equation
   9,919.21 : 14,872.81 = 3,908.09 : x
2. Step 2: Convert to fraction form
   9,919.21/14,872.81 = 3,908.09/x
3. Step 3: Cross multiply
   9,919.21x = 14,872.81 × 3,908.09
4. Step 4: Simplify right side
   9,919.21x = 58,124,280.03
5. Step 5: Solve for x
   x = 58,124,280.03/9,919.21
6. Step 6: Final answer
   x = 5,859.77