Finding the Fourth Proportional to 12,947.85, 17,863.43 and 7,640.01

Step by Step Solution

1. Step 1: Write the proportion equation
   12,947.85 : 17,863.43 = 7,640.01 : x
2. Step 2: Convert to fraction form
   12,947.85/17,863.43 = 7,640.01/x
3. Step 3: Cross multiply
   12,947.85x = 17,863.43 × 7,640.01
4. Step 4: Simplify right side
   12,947.85x = 136,476,745.63
5. Step 5: Solve for x
   x = 136,476,745.63/12,947.85
6. Step 6: Final answer
   x = 10,540.49