Finding the Fourth Proportional to 9,789.89, 14,686.72 and 3,947.09

Step by Step Solution

1. Step 1: Write the proportion equation
   9,789.89 : 14,686.72 = 3,947.09 : x
2. Step 2: Convert to fraction form
   9,789.89/14,686.72 = 3,947.09/x
3. Step 3: Cross multiply
   9,789.89x = 14,686.72 × 3,947.09
4. Step 4: Simplify right side
   9,789.89x = 57,969,805.64
5. Step 5: Solve for x
   x = 57,969,805.64/9,789.89
6. Step 6: Final answer
   x = 5,921.39