Finding the Fourth Proportional to 12,370.78, 17,072.23 and 8,789.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,370.78 : 17,072.23 = 8,789.57 : x
2. Step 2: Convert to fraction form
   12,370.78/17,072.23 = 8,789.57/x
3. Step 3: Cross multiply
   12,370.78x = 17,072.23 × 8,789.57
4. Step 4: Simplify right side
   12,370.78x = 150,057,560.64
5. Step 5: Solve for x
   x = 150,057,560.64/12,370.78
6. Step 6: Final answer
   x = 12,130.00