Finding the Fourth Proportional to 16,979.98, 23,435.16 and 9,428.72

Step by Step Solution

1. Step 1: Write the proportion equation
   16,979.98 : 23,435.16 = 9,428.72 : x
2. Step 2: Convert to fraction form
   16,979.98/23,435.16 = 9,428.72/x
3. Step 3: Cross multiply
   16,979.98x = 23,435.16 × 9,428.72
4. Step 4: Simplify right side
   16,979.98x = 220,963,561.80
5. Step 5: Solve for x
   x = 220,963,561.80/16,979.98
6. Step 6: Final answer
   x = 13,013.19