Finding the Fourth Proportional to 2,080.50, 3,120.78 and 599.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.50 : 3,120.78 = 599.78 : x
2. Step 2: Convert to fraction form
   2,080.50/3,120.78 = 599.78/x
3. Step 3: Cross multiply
   2,080.50x = 3,120.78 × 599.78
4. Step 4: Simplify right side
   2,080.50x = 1,871,781.43
5. Step 5: Solve for x
   x = 1,871,781.43/2,080.50
6. Step 6: Final answer
   x = 899.68