Finding the Fourth Proportional to 15,818.98, 23,771.58 and 8,428.72

Step by Step Solution

1. Step 1: Write the proportion equation
   15,818.98 : 23,771.58 = 8,428.72 : x
2. Step 2: Convert to fraction form
   15,818.98/23,771.58 = 8,428.72/x
3. Step 3: Cross multiply
   15,818.98x = 23,771.58 × 8,428.72
4. Step 4: Simplify right side
   15,818.98x = 200,363,991.78
5. Step 5: Solve for x
   x = 200,363,991.78/15,818.98
6. Step 6: Final answer
   x = 12,666.05