Finding the Fourth Proportional to 2,545.72, 3,818.65 and 814.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,545.72 : 3,818.65 = 814.35 : x
2. Step 2: Convert to fraction form
   2,545.72/3,818.65 = 814.35/x
3. Step 3: Cross multiply
   2,545.72x = 3,818.65 × 814.35
4. Step 4: Simplify right side
   2,545.72x = 3,109,717.63
5. Step 5: Solve for x
   x = 3,109,717.63/2,545.72
6. Step 6: Final answer
   x = 1,221.55