Finding the Fourth Proportional to 2,655.81, 3,665.43 and 1,912.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,655.81 : 3,665.43 = 1,912.23 : x
2. Step 2: Convert to fraction form
   2,655.81/3,665.43 = 1,912.23/x
3. Step 3: Cross multiply
   2,655.81x = 3,665.43 × 1,912.23
4. Step 4: Simplify right side
   2,655.81x = 7,009,145.21
5. Step 5: Solve for x
   x = 7,009,145.21/2,655.81
6. Step 6: Final answer
   x = 2,639.17