Finding the Fourth Proportional to 2,140.65, 3,200.43 and 1,815.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,140.65 : 3,200.43 = 1,815.23 : x
2. Step 2: Convert to fraction form
   2,140.65/3,200.43 = 1,815.23/x
3. Step 3: Cross multiply
   2,140.65x = 3,200.43 × 1,815.23
4. Step 4: Simplify right side
   2,140.65x = 5,809,507.35
5. Step 5: Solve for x
   x = 5,809,507.35/2,140.65
6. Step 6: Final answer
   x = 2,713.89