Finding the Fourth Proportional to 4,978.80, 7,469.73 and 2,789.10

Step by Step Solution

1. Step 1: Write the proportion equation
   4,978.80 : 7,469.73 = 2,789.10 : x
2. Step 2: Convert to fraction form
   4,978.80/7,469.73 = 2,789.10/x
3. Step 3: Cross multiply
   4,978.80x = 7,469.73 × 2,789.10
4. Step 4: Simplify right side
   4,978.80x = 20,833,823.94
5. Step 5: Solve for x
   x = 20,833,823.94/4,978.80
6. Step 6: Final answer
   x = 4,184.51