Finding the Fourth Proportional to 9,906.96, 14,826.94 and 9,640.41

Step by Step Solution

1. Step 1: Write the proportion equation
   9,906.96 : 14,826.94 = 9,640.41 : x
2. Step 2: Convert to fraction form
   9,906.96/14,826.94 = 9,640.41/x
3. Step 3: Cross multiply
   9,906.96x = 14,826.94 × 9,640.41
4. Step 4: Simplify right side
   9,906.96x = 142,937,780.65
5. Step 5: Solve for x
   x = 142,937,780.65/9,906.96
6. Step 6: Final answer
   x = 14,428.02