Finding the Fourth Proportional to 2,662.07, 3,991.78 and 812.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,662.07 : 3,991.78 = 812.73 : x
2. Step 2: Convert to fraction form
   2,662.07/3,991.78 = 812.73/x
3. Step 3: Cross multiply
   2,662.07x = 3,991.78 × 812.73
4. Step 4: Simplify right side
   2,662.07x = 3,244,255.34
5. Step 5: Solve for x
   x = 3,244,255.34/2,662.07
6. Step 6: Final answer
   x = 1,218.70