Finding the Fourth Proportional to 3,870.43, 5,345.59 and 2,609.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.43 : 5,345.59 = 2,609.31 : x
2. Step 2: Convert to fraction form
   3,870.43/5,345.59 = 2,609.31/x
3. Step 3: Cross multiply
   3,870.43x = 5,345.59 × 2,609.31
4. Step 4: Simplify right side
   3,870.43x = 13,948,312.52
5. Step 5: Solve for x
   x = 13,948,312.52/3,870.43
6. Step 6: Final answer
   x = 3,603.81