Finding the Fourth Proportional to 2,819.86, 3,887.28 and 1,978.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,819.86 : 3,887.28 = 1,978.03 : x
2. Step 2: Convert to fraction form
   2,819.86/3,887.28 = 1,978.03/x
3. Step 3: Cross multiply
   2,819.86x = 3,887.28 × 1,978.03
4. Step 4: Simplify right side
   2,819.86x = 7,689,156.46
5. Step 5: Solve for x
   x = 7,689,156.46/2,819.86
6. Step 6: Final answer
   x = 2,726.79