Finding the Fourth Proportional to 2,978.76, 4,112.46 and 1,932.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,978.76 : 4,112.46 = 1,932.78 : x
2. Step 2: Convert to fraction form
   2,978.76/4,112.46 = 1,932.78/x
3. Step 3: Cross multiply
   2,978.76x = 4,112.46 × 1,932.78
4. Step 4: Simplify right side
   2,978.76x = 7,948,480.44
5. Step 5: Solve for x
   x = 7,948,480.44/2,978.76
6. Step 6: Final answer
   x = 2,668.39