Finding the Fourth Proportional to 12,894, 19,341.72 and 3,660.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,894 : 19,341.72 = 3,660.72 : x
2. Step 2: Convert to fraction form
   12,894/19,341.72 = 3,660.72/x
3. Step 3: Cross multiply
   12,894x = 19,341.72 × 3,660.72
4. Step 4: Simplify right side
   12,894x = 70,804,621.24
5. Step 5: Solve for x
   x = 70,804,621.24/12,894
6. Step 6: Final answer
   x = 5,491.28