Finding the Fourth Proportional to 2,800.98, 4,200.96 and 826.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,800.98 : 4,200.96 = 826.20 : x
2. Step 2: Convert to fraction form
   2,800.98/4,200.96 = 826.20/x
3. Step 3: Cross multiply
   2,800.98x = 4,200.96 × 826.20
4. Step 4: Simplify right side
   2,800.98x = 3,470,833.15
5. Step 5: Solve for x
   x = 3,470,833.15/2,800.98
6. Step 6: Final answer
   x = 1,239.15