Finding the Fourth Proportional to 12,689.86, 19,013.82 and 4,365.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,689.86 : 19,013.82 = 4,365.40 : x
2. Step 2: Convert to fraction form
   12,689.86/19,013.82 = 4,365.40/x
3. Step 3: Cross multiply
   12,689.86x = 19,013.82 × 4,365.40
4. Step 4: Simplify right side
   12,689.86x = 83,002,929.83
5. Step 5: Solve for x
   x = 83,002,929.83/12,689.86
6. Step 6: Final answer
   x = 6,540.89