Finding the Fourth Proportional to 2,379.94, 3,569.94 and 839.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,379.94 : 3,569.94 = 839.86 : x
2. Step 2: Convert to fraction form
   2,379.94/3,569.94 = 839.86/x
3. Step 3: Cross multiply
   2,379.94x = 3,569.94 × 839.86
4. Step 4: Simplify right side
   2,379.94x = 2,998,249.81
5. Step 5: Solve for x
   x = 2,998,249.81/2,379.94
6. Step 6: Final answer
   x = 1,259.80