Finding the Fourth Proportional to 1,641.10, 2,461.12 and 819.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,641.10 : 2,461.12 = 819.15 : x
2. Step 2: Convert to fraction form
   1,641.10/2,461.12 = 819.15/x
3. Step 3: Cross multiply
   1,641.10x = 2,461.12 × 819.15
4. Step 4: Simplify right side
   1,641.10x = 2,016,026.45
5. Step 5: Solve for x
   x = 2,016,026.45/1,641.10
6. Step 6: Final answer
   x = 1,228.46