Finding the Fourth Proportional to 16,980.19, 23,436.33 and 12,957.47

Step by Step Solution

1. Step 1: Write the proportion equation
   16,980.19 : 23,436.33 = 12,957.47 : x
2. Step 2: Convert to fraction form
   16,980.19/23,436.33 = 12,957.47/x
3. Step 3: Cross multiply
   16,980.19x = 23,436.33 × 12,957.47
4. Step 4: Simplify right side
   16,980.19x = 303,675,542.89
5. Step 5: Solve for x
   x = 303,675,542.89/16,980.19
6. Step 6: Final answer
   x = 17,884.11