Finding the Fourth Proportional to 2,387.16, 3,290.85 and 1,639.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,387.16 : 3,290.85 = 1,639.98 : x
2. Step 2: Convert to fraction form
   2,387.16/3,290.85 = 1,639.98/x
3. Step 3: Cross multiply
   2,387.16x = 3,290.85 × 1,639.98
4. Step 4: Simplify right side
   2,387.16x = 5,396,928.18
5. Step 5: Solve for x
   x = 5,396,928.18/2,387.16
6. Step 6: Final answer
   x = 2,260.82