Finding the Fourth Proportional to 2,215.74, 3,323.78 and 810.00

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.74 : 3,323.78 = 810.00 : x
2. Step 2: Convert to fraction form
   2,215.74/3,323.78 = 810.00/x
3. Step 3: Cross multiply
   2,215.74x = 3,323.78 × 810.00
4. Step 4: Simplify right side
   2,215.74x = 2,692,247.21
5. Step 5: Solve for x
   x = 2,692,247.21/2,215.74
6. Step 6: Final answer
   x = 1,215.06