Finding the Fourth Proportional to 2,506.51, 3,759.90 and 839.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,506.51 : 3,759.90 = 839.96 : x
2. Step 2: Convert to fraction form
   2,506.51/3,759.90 = 839.96/x
3. Step 3: Cross multiply
   2,506.51x = 3,759.90 × 839.96
4. Step 4: Simplify right side
   2,506.51x = 3,158,165.60
5. Step 5: Solve for x
   x = 3,158,165.60/2,506.51
6. Step 6: Final answer
   x = 1,259.99