Finding the Fourth Proportional to 1,978.63, 2,730.55 and 1,281.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.63 : 2,730.55 = 1,281.22 : x
2. Step 2: Convert to fraction form
   1,978.63/2,730.55 = 1,281.22/x
3. Step 3: Cross multiply
   1,978.63x = 2,730.55 × 1,281.22
4. Step 4: Simplify right side
   1,978.63x = 3,498,435.27
5. Step 5: Solve for x
   x = 3,498,435.27/1,978.63
6. Step 6: Final answer
   x = 1,768.11