Finding the Fourth Proportional to 21,819.66, 30,109.34 and 12,259.02

Step by Step Solution

1. Step 1: Write the proportion equation
   21,819.66 : 30,109.34 = 12,259.02 : x
2. Step 2: Convert to fraction form
   21,819.66/30,109.34 = 12,259.02/x
3. Step 3: Cross multiply
   21,819.66x = 30,109.34 × 12,259.02
4. Step 4: Simplify right side
   21,819.66x = 369,111,001.25
5. Step 5: Solve for x
   x = 369,111,001.25/21,819.66
6. Step 6: Final answer
   x = 16,916.44