Finding the Fourth Proportional to 9,917.21, 14,869.81 and 3,906.09

Step by Step Solution

1. Step 1: Write the proportion equation
   9,917.21 : 14,869.81 = 3,906.09 : x
2. Step 2: Convert to fraction form
   9,917.21/14,869.81 = 3,906.09/x
3. Step 3: Cross multiply
   9,917.21x = 14,869.81 × 3,906.09
4. Step 4: Simplify right side
   9,917.21x = 58,082,821.03
5. Step 5: Solve for x
   x = 58,082,821.03/9,917.21
6. Step 6: Final answer
   x = 5,856.77