Finding the Fourth Proportional to 2,118.09, 3,176.73 and 819.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,118.09 : 3,176.73 = 819.30 : x
2. Step 2: Convert to fraction form
   2,118.09/3,176.73 = 819.30/x
3. Step 3: Cross multiply
   2,118.09x = 3,176.73 × 819.30
4. Step 4: Simplify right side
   2,118.09x = 2,602,694.89
5. Step 5: Solve for x
   x = 2,602,694.89/2,118.09
6. Step 6: Final answer
   x = 1,228.79