Finding the Fourth Proportional to 2,608.70, 3,911.77 and 1,290.93

Step by Step Solution

1. Step 1: Write the proportion equation
   2,608.70 : 3,911.77 = 1,290.93 : x
2. Step 2: Convert to fraction form
   2,608.70/3,911.77 = 1,290.93/x
3. Step 3: Cross multiply
   2,608.70x = 3,911.77 × 1,290.93
4. Step 4: Simplify right side
   2,608.70x = 5,049,818.02
5. Step 5: Solve for x
   x = 5,049,818.02/2,608.70
6. Step 6: Final answer
   x = 1,935.76