Finding the Fourth Proportional to 5,057.52, 6,978.72 and 2,818.80

Step by Step Solution

1. Step 1: Write the proportion equation
   5,057.52 : 6,978.72 = 2,818.80 : x
2. Step 2: Convert to fraction form
   5,057.52/6,978.72 = 2,818.80/x
3. Step 3: Cross multiply
   5,057.52x = 6,978.72 × 2,818.80
4. Step 4: Simplify right side
   5,057.52x = 19,671,615.94
5. Step 5: Solve for x
   x = 19,671,615.94/5,057.52
6. Step 6: Final answer
   x = 3,889.58