Finding the Fourth Proportional to 12,885.57, 19,328.34 and 3,651.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,885.57 : 19,328.34 = 3,651.57 : x
2. Step 2: Convert to fraction form
   12,885.57/19,328.34 = 3,651.57/x
3. Step 3: Cross multiply
   12,885.57x = 19,328.34 × 3,651.57
4. Step 4: Simplify right side
   12,885.57x = 70,578,786.49
5. Step 5: Solve for x
   x = 70,578,786.49/12,885.57
6. Step 6: Final answer
   x = 5,477.35