Finding the Fourth Proportional to 3,429.63, 5,137.59 and 1,578.21

Step by Step Solution

1. Step 1: Write the proportion equation
   3,429.63 : 5,137.59 = 1,578.21 : x
2. Step 2: Convert to fraction form
   3,429.63/5,137.59 = 1,578.21/x
3. Step 3: Cross multiply
   3,429.63x = 5,137.59 × 1,578.21
4. Step 4: Simplify right side
   3,429.63x = 8,108,172.20
5. Step 5: Solve for x
   x = 8,108,172.20/3,429.63
6. Step 6: Final answer
   x = 2,364.15