Finding the Fourth Proportional to 9,714.89, 14,568.69 and 3,139.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,714.89 : 14,568.69 = 3,139.31 : x
2. Step 2: Convert to fraction form
   9,714.89/14,568.69 = 3,139.31/x
3. Step 3: Cross multiply
   9,714.89x = 14,568.69 × 3,139.31
4. Step 4: Simplify right side
   9,714.89x = 45,735,682.40
5. Step 5: Solve for x
   x = 45,735,682.40/9,714.89
6. Step 6: Final answer
   x = 4,707.79