Finding the Fourth Proportional to 2,800.25, 4,201.28 and 1,339.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,800.25 : 4,201.28 = 1,339.50 : x
2. Step 2: Convert to fraction form
   2,800.25/4,201.28 = 1,339.50/x
3. Step 3: Cross multiply
   2,800.25x = 4,201.28 × 1,339.50
4. Step 4: Simplify right side
   2,800.25x = 5,627,607.86
5. Step 5: Solve for x
   x = 5,627,607.86/2,800.25
6. Step 6: Final answer
   x = 2,009.68