Finding the Fourth Proportional to 12,860.67, 19,289.43 and 3,500.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,860.67 : 19,289.43 = 3,500.31 : x
2. Step 2: Convert to fraction form
   12,860.67/19,289.43 = 3,500.31/x
3. Step 3: Cross multiply
   12,860.67x = 19,289.43 × 3,500.31
4. Step 4: Simplify right side
   12,860.67x = 67,518,984.72
5. Step 5: Solve for x
   x = 67,518,984.72/12,860.67
6. Step 6: Final answer
   x = 5,250.04