Finding the Fourth Proportional to 21,802.71, 30,093.50 and 12,856.17

Step by Step Solution

1. Step 1: Write the proportion equation
   21,802.71 : 30,093.50 = 12,856.17 : x
2. Step 2: Convert to fraction form
   21,802.71/30,093.50 = 12,856.17/x
3. Step 3: Cross multiply
   21,802.71x = 30,093.50 × 12,856.17
4. Step 4: Simplify right side
   21,802.71x = 386,887,087.61
5. Step 5: Solve for x
   x = 386,887,087.61/21,802.71
6. Step 6: Final answer
   x = 17,744.91