Finding the Fourth Proportional to 2,545.34, 3,818.57 and 813.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,545.34 : 3,818.57 = 813.96 : x
2. Step 2: Convert to fraction form
   2,545.34/3,818.57 = 813.96/x
3. Step 3: Cross multiply
   2,545.34x = 3,818.57 × 813.96
4. Step 4: Simplify right side
   2,545.34x = 3,108,159.17
5. Step 5: Solve for x
   x = 3,108,159.17/2,545.34
6. Step 6: Final answer
   x = 1,221.12