Finding the Fourth Proportional to 3,470.90, 4,789.83 and 1,978.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,470.90 : 4,789.83 = 1,978.80 : x
2. Step 2: Convert to fraction form
   3,470.90/4,789.83 = 1,978.80/x
3. Step 3: Cross multiply
   3,470.90x = 4,789.83 × 1,978.80
4. Step 4: Simplify right side
   3,470.90x = 9,478,145.48
5. Step 5: Solve for x
   x = 9,478,145.48/3,470.90
6. Step 6: Final answer
   x = 2,730.75