Finding the Fourth Proportional to 3,470.30, 4,788.69 and 1,978.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,470.30 : 4,788.69 = 1,978.55 : x
2. Step 2: Convert to fraction form
   3,470.30/4,788.69 = 1,978.55/x
3. Step 3: Cross multiply
   3,470.30x = 4,788.69 × 1,978.55
4. Step 4: Simplify right side
   3,470.30x = 9,474,662.60
5. Step 5: Solve for x
   x = 9,474,662.60/3,470.30
6. Step 6: Final answer
   x = 2,730.21