Finding the Fourth Proportional to 12,945.20, 19,417.41 and 3,585.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,945.20 : 19,417.41 = 3,585.78 : x
2. Step 2: Convert to fraction form
   12,945.20/19,417.41 = 3,585.78/x
3. Step 3: Cross multiply
   12,945.20x = 19,417.41 × 3,585.78
4. Step 4: Simplify right side
   12,945.20x = 69,626,560.43
5. Step 5: Solve for x
   x = 69,626,560.43/12,945.20
6. Step 6: Final answer
   x = 5,378.56