Finding the Fourth Proportional to 3,426.22, 5,137.39 and 1,085.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,426.22 : 5,137.39 = 1,085.78 : x
2. Step 2: Convert to fraction form
   3,426.22/5,137.39 = 1,085.78/x
3. Step 3: Cross multiply
   3,426.22x = 5,137.39 × 1,085.78
4. Step 4: Simplify right side
   3,426.22x = 5,578,075.31
5. Step 5: Solve for x
   x = 5,578,075.31/3,426.22
6. Step 6: Final answer
   x = 1,628.06