Finding the Fourth Proportional to 3,685.30, 5,513.55 and 2,389.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,685.30 : 5,513.55 = 2,389.30 : x
2. Step 2: Convert to fraction form
   3,685.30/5,513.55 = 2,389.30/x
3. Step 3: Cross multiply
   3,685.30x = 5,513.55 × 2,389.30
4. Step 4: Simplify right side
   3,685.30x = 13,173,525.02
5. Step 5: Solve for x
   x = 13,173,525.02/3,685.30
6. Step 6: Final answer
   x = 3,574.61