Finding the Fourth Proportional to 8,643.89, 11,928.72 and 5,107.09

Step by Step Solution

1. Step 1: Write the proportion equation
   8,643.89 : 11,928.72 = 5,107.09 : x
2. Step 2: Convert to fraction form
   8,643.89/11,928.72 = 5,107.09/x
3. Step 3: Cross multiply
   8,643.89x = 11,928.72 × 5,107.09
4. Step 4: Simplify right side
   8,643.89x = 60,921,021.09
5. Step 5: Solve for x
   x = 60,921,021.09/8,643.89
6. Step 6: Final answer
   x = 7,047.88