Finding the Fourth Proportional to 2,160.81, 3,240.42 and 1,699.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,160.81 : 3,240.42 = 1,699.49 : x
2. Step 2: Convert to fraction form
   2,160.81/3,240.42 = 1,699.49/x
3. Step 3: Cross multiply
   2,160.81x = 3,240.42 × 1,699.49
4. Step 4: Simplify right side
   2,160.81x = 5,507,061.39
5. Step 5: Solve for x
   x = 5,507,061.39/2,160.81
6. Step 6: Final answer
   x = 2,548.61