Finding the Fourth Proportional to 3,899.17, 5,850.78 and 1,818.57

Step by Step Solution

1. Step 1: Write the proportion equation
   3,899.17 : 5,850.78 = 1,818.57 : x
2. Step 2: Convert to fraction form
   3,899.17/5,850.78 = 1,818.57/x
3. Step 3: Cross multiply
   3,899.17x = 5,850.78 × 1,818.57
4. Step 4: Simplify right side
   3,899.17x = 10,640,052.98
5. Step 5: Solve for x
   x = 10,640,052.98/3,899.17
6. Step 6: Final answer
   x = 2,728.80