Finding the Fourth Proportional to 2,607.93, 3,909.87 and 1,290.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,607.93 : 3,909.87 = 1,290.78 : x
2. Step 2: Convert to fraction form
   2,607.93/3,909.87 = 1,290.78/x
3. Step 3: Cross multiply
   2,607.93x = 3,909.87 × 1,290.78
4. Step 4: Simplify right side
   2,607.93x = 5,046,771.00
5. Step 5: Solve for x
   x = 5,046,771.00/2,607.93
6. Step 6: Final answer
   x = 1,935.16