Finding the Fourth Proportional to 3,470.78, 4,789.59 and 1,978.67

Step by Step Solution

1. Step 1: Write the proportion equation
   3,470.78 : 4,789.59 = 1,978.67 : x
2. Step 2: Convert to fraction form
   3,470.78/4,789.59 = 1,978.67/x
3. Step 3: Cross multiply
   3,470.78x = 4,789.59 × 1,978.67
4. Step 4: Simplify right side
   3,470.78x = 9,476,990.31
5. Step 5: Solve for x
   x = 9,476,990.31/3,470.78
6. Step 6: Final answer
   x = 2,730.51