Finding the Fourth Proportional to 2,800.68, 4,200.03 and 825.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,800.68 : 4,200.03 = 825.72 : x
2. Step 2: Convert to fraction form
   2,800.68/4,200.03 = 825.72/x
3. Step 3: Cross multiply
   2,800.68x = 4,200.03 × 825.72
4. Step 4: Simplify right side
   2,800.68x = 3,468,048.77
5. Step 5: Solve for x
   x = 3,468,048.77/2,800.68
6. Step 6: Final answer
   x = 1,238.29