Finding the Fourth Proportional to 16,426.18, 24,621.61 and 8,520.78

Step by Step Solution

1. Step 1: Write the proportion equation
   16,426.18 : 24,621.61 = 8,520.78 : x
2. Step 2: Convert to fraction form
   16,426.18/24,621.61 = 8,520.78/x
3. Step 3: Cross multiply
   16,426.18x = 24,621.61 × 8,520.78
4. Step 4: Simplify right side
   16,426.18x = 209,795,322.06
5. Step 5: Solve for x
   x = 209,795,322.06/16,426.18
6. Step 6: Final answer
   x = 12,772.01