Finding the Fourth Proportional to 21,802.81, 30,083.22 and 12,847.05

Step by Step Solution

1. Step 1: Write the proportion equation
   21,802.81 : 30,083.22 = 12,847.05 : x
2. Step 2: Convert to fraction form
   21,802.81/30,083.22 = 12,847.05/x
3. Step 3: Cross multiply
   21,802.81x = 30,083.22 × 12,847.05
4. Step 4: Simplify right side
   21,802.81x = 386,480,631.50
5. Step 5: Solve for x
   x = 386,480,631.50/21,802.81
6. Step 6: Final answer
   x = 17,726.18