Finding the Fourth Proportional to 16,891.38, 23,298.03 and 12,905.60

Step by Step Solution

1. Step 1: Write the proportion equation
   16,891.38 : 23,298.03 = 12,905.60 : x
2. Step 2: Convert to fraction form
   16,891.38/23,298.03 = 12,905.60/x
3. Step 3: Cross multiply
   16,891.38x = 23,298.03 × 12,905.60
4. Step 4: Simplify right side
   16,891.38x = 300,674,939.48
5. Step 5: Solve for x
   x = 300,674,939.48/16,891.38
6. Step 6: Final answer
   x = 17,800.50