Finding the Fourth Proportional to 2,991.57, 4,487.52 and 800.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,991.57 : 4,487.52 = 800.31 : x
2. Step 2: Convert to fraction form
   2,991.57/4,487.52 = 800.31/x
3. Step 3: Cross multiply
   2,991.57x = 4,487.52 × 800.31
4. Step 4: Simplify right side
   2,991.57x = 3,591,407.13
5. Step 5: Solve for x
   x = 3,591,407.13/2,991.57
6. Step 6: Final answer
   x = 1,200.51