Finding the Fourth Proportional to 3,899.80, 5,821.94 and 3,763.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,899.80 : 5,821.94 = 3,763.12 : x
2. Step 2: Convert to fraction form
   3,899.80/5,821.94 = 3,763.12/x
3. Step 3: Cross multiply
   3,899.80x = 5,821.94 × 3,763.12
4. Step 4: Simplify right side
   3,899.80x = 21,908,658.85
5. Step 5: Solve for x
   x = 21,908,658.85/3,899.80
6. Step 6: Final answer
   x = 5,617.89