Finding the Fourth Proportional to 2,819.93, 3,887.37 and 1,978.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,819.93 : 3,887.37 = 1,978.09 : x
2. Step 2: Convert to fraction form
   2,819.93/3,887.37 = 1,978.09/x
3. Step 3: Cross multiply
   2,819.93x = 3,887.37 × 1,978.09
4. Step 4: Simplify right side
   2,819.93x = 7,689,567.72
5. Step 5: Solve for x
   x = 7,689,567.72/2,819.93
6. Step 6: Final answer
   x = 2,726.86