Finding the Fourth Proportional to 12,859.78, 19,290.06 and 3,625.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,859.78 : 19,290.06 = 3,625.78 : x
2. Step 2: Convert to fraction form
   12,859.78/19,290.06 = 3,625.78/x
3. Step 3: Cross multiply
   12,859.78x = 19,290.06 × 3,625.78
4. Step 4: Simplify right side
   12,859.78x = 69,941,513.75
5. Step 5: Solve for x
   x = 69,941,513.75/12,859.78
6. Step 6: Final answer
   x = 5,438.78