Finding the Fourth Proportional to 8,951.40, 13,410.99 and 8,424.29

Step by Step Solution

1. Step 1: Write the proportion equation
   8,951.40 : 13,410.99 = 8,424.29 : x
2. Step 2: Convert to fraction form
   8,951.40/13,410.99 = 8,424.29/x
3. Step 3: Cross multiply
   8,951.40x = 13,410.99 × 8,424.29
4. Step 4: Simplify right side
   8,951.40x = 112,978,001.89
5. Step 5: Solve for x
   x = 112,978,001.89/8,951.40
6. Step 6: Final answer
   x = 12,621.27