Finding the Fourth Proportional to 2,274.18, 3,411.72 and 813.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,274.18 : 3,411.72 = 813.30 : x
2. Step 2: Convert to fraction form
   2,274.18/3,411.72 = 813.30/x
3. Step 3: Cross multiply
   2,274.18x = 3,411.72 × 813.30
4. Step 4: Simplify right side
   2,274.18x = 2,774,751.88
5. Step 5: Solve for x
   x = 2,774,751.88/2,274.18
6. Step 6: Final answer
   x = 1,220.11