Finding the Fourth Proportional to 1,978.47, 2,732.27 and 1,280.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.47 : 2,732.27 = 1,280.25 : x
2. Step 2: Convert to fraction form
   1,978.47/2,732.27 = 1,280.25/x
3. Step 3: Cross multiply
   1,978.47x = 2,732.27 × 1,280.25
4. Step 4: Simplify right side
   1,978.47x = 3,497,982.27
5. Step 5: Solve for x
   x = 3,497,982.27/1,978.47
6. Step 6: Final answer
   x = 1,768.02