Finding the Fourth Proportional to 2,991.83, 4,487.42 and 800.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,991.83 : 4,487.42 = 800.78 : x
2. Step 2: Convert to fraction form
   2,991.83/4,487.42 = 800.78/x
3. Step 3: Cross multiply
   2,991.83x = 4,487.42 × 800.78
4. Step 4: Simplify right side
   2,991.83x = 3,593,409.75
5. Step 5: Solve for x
   x = 3,593,409.75/2,991.83
6. Step 6: Final answer
   x = 1,201.08