Finding the Fourth Proportional to 3,699.83, 5,105.86 and 2,021.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,699.83 : 5,105.86 = 2,021.30 : x
2. Step 2: Convert to fraction form
   3,699.83/5,105.86 = 2,021.30/x
3. Step 3: Cross multiply
   3,699.83x = 5,105.86 × 2,021.30
4. Step 4: Simplify right side
   3,699.83x = 10,320,497.79
5. Step 5: Solve for x
   x = 10,320,497.79/3,699.83
6. Step 6: Final answer
   x = 2,789.45