Finding the Fourth Proportional to 2,606.18, 3,906.02 and 1,288.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,606.18 : 3,906.02 = 1,288.51 : x
2. Step 2: Convert to fraction form
   2,606.18/3,906.02 = 1,288.51/x
3. Step 3: Cross multiply
   2,606.18x = 3,906.02 × 1,288.51
4. Step 4: Simplify right side
   2,606.18x = 5,032,939.29
5. Step 5: Solve for x
   x = 5,032,939.29/2,606.18
6. Step 6: Final answer
   x = 1,931.16