Finding the Fourth Proportional to 21,790.49, 30,069.92 and 12,099.34

Step by Step Solution

1. Step 1: Write the proportion equation
   21,790.49 : 30,069.92 = 12,099.34 : x
2. Step 2: Convert to fraction form
   21,790.49/30,069.92 = 12,099.34/x
3. Step 3: Cross multiply
   21,790.49x = 30,069.92 × 12,099.34
4. Step 4: Simplify right side
   21,790.49x = 363,826,140.93
5. Step 5: Solve for x
   x = 363,826,140.93/21,790.49
6. Step 6: Final answer
   x = 16,696.56