Finding the Fourth Proportional to 1,862.18, 2,790.69 and 820.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,862.18 : 2,790.69 = 820.62 : x
2. Step 2: Convert to fraction form
   1,862.18/2,790.69 = 820.62/x
3. Step 3: Cross multiply
   1,862.18x = 2,790.69 × 820.62
4. Step 4: Simplify right side
   1,862.18x = 2,290,092.95
5. Step 5: Solve for x
   x = 2,290,092.95/1,862.18
6. Step 6: Final answer
   x = 1,229.79