Finding the Fourth Proportional to 12,959.78, 19,439.71 and 3,600.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,959.78 : 19,439.71 = 3,600.31 : x
2. Step 2: Convert to fraction form
   12,959.78/19,439.71 = 3,600.31/x
3. Step 3: Cross multiply
   12,959.78x = 19,439.71 × 3,600.31
4. Step 4: Simplify right side
   12,959.78x = 69,988,924.71
5. Step 5: Solve for x
   x = 69,988,924.71/12,959.78
6. Step 6: Final answer
   x = 5,400.47