Finding the Fourth Proportional to 1,978.45, 2,728.86 and 1,270.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.45 : 2,728.86 = 1,270.48 : x
2. Step 2: Convert to fraction form
   1,978.45/2,728.86 = 1,270.48/x
3. Step 3: Cross multiply
   1,978.45x = 2,728.86 × 1,270.48
4. Step 4: Simplify right side
   1,978.45x = 3,466,962.05
5. Step 5: Solve for x
   x = 3,466,962.05/1,978.45
6. Step 6: Final answer
   x = 1,752.36