Finding the Fourth Proportional to 19,641.47, 27,104.78 and 10,689

Step by Step Solution

1. Step 1: Write the proportion equation
   19,641.47 : 27,104.78 = 10,689 : x
2. Step 2: Convert to fraction form
   19,641.47/27,104.78 = 10,689/x
3. Step 3: Cross multiply
   19,641.47x = 27,104.78 × 10,689
4. Step 4: Simplify right side
   19,641.47x = 289,722,939.98
5. Step 5: Solve for x
   x = 289,722,939.98/19,641.47
6. Step 6: Final answer
   x = 14,750.58