Finding the Fourth Proportional to 5,057.37, 6,978.78 and 2,819.34

Step by Step Solution

1. Step 1: Write the proportion equation
   5,057.37 : 6,978.78 = 2,819.34 : x
2. Step 2: Convert to fraction form
   5,057.37/6,978.78 = 2,819.34/x
3. Step 3: Cross multiply
   5,057.37x = 6,978.78 × 2,819.34
4. Step 4: Simplify right side
   5,057.37x = 19,675,553.61
5. Step 5: Solve for x
   x = 19,675,553.61/5,057.37
6. Step 6: Final answer
   x = 3,890.47