Finding the Fourth Proportional to 1,821.28, 2,510.37 and 1,290.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,821.28 : 2,510.37 = 1,290.34 : x
2. Step 2: Convert to fraction form
   1,821.28/2,510.37 = 1,290.34/x
3. Step 3: Cross multiply
   1,821.28x = 2,510.37 × 1,290.34
4. Step 4: Simplify right side
   1,821.28x = 3,239,230.83
5. Step 5: Solve for x
   x = 3,239,230.83/1,821.28
6. Step 6: Final answer
   x = 1,778.55