Finding the Fourth Proportional to 2,300.60, 3,451.40 and 839.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,300.60 : 3,451.40 = 839.75 : x
2. Step 2: Convert to fraction form
   2,300.60/3,451.40 = 839.75/x
3. Step 3: Cross multiply
   2,300.60x = 3,451.40 × 839.75
4. Step 4: Simplify right side
   2,300.60x = 2,898,299.57
5. Step 5: Solve for x
   x = 2,898,299.57/2,300.60
6. Step 6: Final answer
   x = 1,259.80