Finding the Fourth Proportional to 16,807.10, 23,182.20 and 15,309

Step by Step Solution

1. Step 1: Write the proportion equation
   16,807.10 : 23,182.20 = 15,309 : x
2. Step 2: Convert to fraction form
   16,807.10/23,182.20 = 15,309/x
3. Step 3: Cross multiply
   16,807.10x = 23,182.20 × 15,309
4. Step 4: Simplify right side
   16,807.10x = 354,896,299.80
5. Step 5: Solve for x
   x = 354,896,299.80/16,807.10
6. Step 6: Final answer
   x = 21,115.86