Finding the Fourth Proportional to 2,118.52, 3,176.46 and 819.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,118.52 : 3,176.46 = 819.40 : x
2. Step 2: Convert to fraction form
   2,118.52/3,176.46 = 819.40/x
3. Step 3: Cross multiply
   2,118.52x = 3,176.46 × 819.40
4. Step 4: Simplify right side
   2,118.52x = 2,602,791.32
5. Step 5: Solve for x
   x = 2,602,791.32/2,118.52
6. Step 6: Final answer
   x = 1,228.59