Finding the Fourth Proportional to 15,892.38, 21,931.56 and 8,818.80

Step by Step Solution

1. Step 1: Write the proportion equation
   15,892.38 : 21,931.56 = 8,818.80 : x
2. Step 2: Convert to fraction form
   15,892.38/21,931.56 = 8,818.80/x
3. Step 3: Cross multiply
   15,892.38x = 21,931.56 × 8,818.80
4. Step 4: Simplify right side
   15,892.38x = 193,410,041.33
5. Step 5: Solve for x
   x = 193,410,041.33/15,892.38
6. Step 6: Final answer
   x = 12,169.99