Finding the Fourth Proportional to 3,391.59, 5,081.04 and 2,000.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,391.59 : 5,081.04 = 2,000.78 : x
2. Step 2: Convert to fraction form
   3,391.59/5,081.04 = 2,000.78/x
3. Step 3: Cross multiply
   3,391.59x = 5,081.04 × 2,000.78
4. Step 4: Simplify right side
   3,391.59x = 10,166,017.81
5. Step 5: Solve for x
   x = 10,166,017.81/3,391.59
6. Step 6: Final answer
   x = 2,997.42