Finding the Fourth Proportional to 12,908.61, 17,819.34 and 8,722.53

Step by Step Solution

1. Step 1: Write the proportion equation
   12,908.61 : 17,819.34 = 8,722.53 : x
2. Step 2: Convert to fraction form
   12,908.61/17,819.34 = 8,722.53/x
3. Step 3: Cross multiply
   12,908.61x = 17,819.34 × 8,722.53
4. Step 4: Simplify right side
   12,908.61x = 155,429,727.73
5. Step 5: Solve for x
   x = 155,429,727.73/12,908.61
6. Step 6: Final answer
   x = 12,040.78