Finding the Fourth Proportional to 2,662.91, 3,994.79 and 813.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,662.91 : 3,994.79 = 813.89 : x
2. Step 2: Convert to fraction form
   2,662.91/3,994.79 = 813.89/x
3. Step 3: Cross multiply
   2,662.91x = 3,994.79 × 813.89
4. Step 4: Simplify right side
   2,662.91x = 3,251,295.59
5. Step 5: Solve for x
   x = 3,251,295.59/2,662.91
6. Step 6: Final answer
   x = 1,220.96