Finding the Fourth Proportional to 2,378.50, 3,569.38 and 839.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,378.50 : 3,569.38 = 839.50 : x
2. Step 2: Convert to fraction form
   2,378.50/3,569.38 = 839.50/x
3. Step 3: Cross multiply
   2,378.50x = 3,569.38 × 839.50
4. Step 4: Simplify right side
   2,378.50x = 2,996,494.51
5. Step 5: Solve for x
   x = 2,996,494.51/2,378.50
6. Step 6: Final answer
   x = 1,259.83