Finding the Fourth Proportional to 10,867.71, 16,280.42 and 8,012.99

Step by Step Solution

1. Step 1: Write the proportion equation
   10,867.71 : 16,280.42 = 8,012.99 : x
2. Step 2: Convert to fraction form
   10,867.71/16,280.42 = 8,012.99/x
3. Step 3: Cross multiply
   10,867.71x = 16,280.42 × 8,012.99
4. Step 4: Simplify right side
   10,867.71x = 130,454,802.59
5. Step 5: Solve for x
   x = 130,454,802.59/10,867.71
6. Step 6: Final answer
   x = 12,003.89