Finding the Fourth Proportional to 21,869.82, 30,176.82 and 12,916.08

Step by Step Solution

1. Step 1: Write the proportion equation
   21,869.82 : 30,176.82 = 12,916.08 : x
2. Step 2: Convert to fraction form
   21,869.82/30,176.82 = 12,916.08/x
3. Step 3: Cross multiply
   21,869.82x = 30,176.82 × 12,916.08
4. Step 4: Simplify right side
   21,869.82x = 389,766,221.27
5. Step 5: Solve for x
   x = 389,766,221.27/21,869.82
6. Step 6: Final answer
   x = 17,822.10