Finding the Fourth Proportional to 11,937.69, 16,456.91 and 8,389.89

Step by Step Solution

1. Step 1: Write the proportion equation
   11,937.69 : 16,456.91 = 8,389.89 : x
2. Step 2: Convert to fraction form
   11,937.69/16,456.91 = 8,389.89/x
3. Step 3: Cross multiply
   11,937.69x = 16,456.91 × 8,389.89
4. Step 4: Simplify right side
   11,937.69x = 138,071,622.69
5. Step 5: Solve for x
   x = 138,071,622.69/11,937.69
6. Step 6: Final answer
   x = 11,566.03