Finding the Fourth Proportional to 2,819.97, 3,887.41 and 1,978.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,819.97 : 3,887.41 = 1,978.12 : x
2. Step 2: Convert to fraction form
   2,819.97/3,887.41 = 1,978.12/x
3. Step 3: Cross multiply
   2,819.97x = 3,887.41 × 1,978.12
4. Step 4: Simplify right side
   2,819.97x = 7,689,763.47
5. Step 5: Solve for x
   x = 7,689,763.47/2,819.97
6. Step 6: Final answer
   x = 2,726.90