Finding the Fourth Proportional to 2,274.86, 3,411.75 and 813.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,274.86 : 3,411.75 = 813.89 : x
2. Step 2: Convert to fraction form
   2,274.86/3,411.75 = 813.89/x
3. Step 3: Cross multiply
   2,274.86x = 3,411.75 × 813.89
4. Step 4: Simplify right side
   2,274.86x = 2,776,789.21
5. Step 5: Solve for x
   x = 2,776,789.21/2,274.86
6. Step 6: Final answer
   x = 1,220.64