Finding the Fourth Proportional to 3,699.78, 5,105.46 and 2,021.10

Step by Step Solution

1. Step 1: Write the proportion equation
   3,699.78 : 5,105.46 = 2,021.10 : x
2. Step 2: Convert to fraction form
   3,699.78/5,105.46 = 2,021.10/x
3. Step 3: Cross multiply
   3,699.78x = 5,105.46 × 2,021.10
4. Step 4: Simplify right side
   3,699.78x = 10,318,645.21
5. Step 5: Solve for x
   x = 10,318,645.21/3,699.78
6. Step 6: Final answer
   x = 2,788.99