Finding the Fourth Proportional to 12,783.48, 17,640.94 and 7,118.04

Step by Step Solution

1. Step 1: Write the proportion equation
   12,783.48 : 17,640.94 = 7,118.04 : x
2. Step 2: Convert to fraction form
   12,783.48/17,640.94 = 7,118.04/x
3. Step 3: Cross multiply
   12,783.48x = 17,640.94 × 7,118.04
4. Step 4: Simplify right side
   12,783.48x = 125,568,916.56
5. Step 5: Solve for x
   x = 125,568,916.56/12,783.48
6. Step 6: Final answer
   x = 9,822.75