Finding the Fourth Proportional to 2,655.15, 3,664.47 and 1,911.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,655.15 : 3,664.47 = 1,911.57 : x
2. Step 2: Convert to fraction form
   2,655.15/3,664.47 = 1,911.57/x
3. Step 3: Cross multiply
   2,655.15x = 3,664.47 × 1,911.57
4. Step 4: Simplify right side
   2,655.15x = 7,004,890.92
5. Step 5: Solve for x
   x = 7,004,890.92/2,655.15
6. Step 6: Final answer
   x = 2,638.23