Finding the Fourth Proportional to 2,300.40, 3,450.80 and 839.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,300.40 : 3,450.80 = 839.57 : x
2. Step 2: Convert to fraction form
   2,300.40/3,450.80 = 839.57/x
3. Step 3: Cross multiply
   2,300.40x = 3,450.80 × 839.57
4. Step 4: Simplify right side
   2,300.40x = 2,897,173.00
5. Step 5: Solve for x
   x = 2,897,173.00/2,300.40
6. Step 6: Final answer
   x = 1,259.42