Finding the Fourth Proportional to 28,271.92, 42,401.40 and 12,694

Step by Step Solution

1. Step 1: Write the proportion equation
   28,271.92 : 42,401.40 = 12,694 : x
2. Step 2: Convert to fraction form
   28,271.92/42,401.40 = 12,694/x
3. Step 3: Cross multiply
   28,271.92x = 42,401.40 × 12,694
4. Step 4: Simplify right side
   28,271.92x = 538,243,371.60
5. Step 5: Solve for x
   x = 538,243,371.60/28,271.92
6. Step 6: Final answer
   x = 19,038.09