Finding the Fourth Proportional to 3,699.53, 5,105.39 and 2,020.99

Step by Step Solution

1. Step 1: Write the proportion equation
   3,699.53 : 5,105.39 = 2,020.99 : x
2. Step 2: Convert to fraction form
   3,699.53/5,105.39 = 2,020.99/x
3. Step 3: Cross multiply
   3,699.53x = 5,105.39 × 2,020.99
4. Step 4: Simplify right side
   3,699.53x = 10,317,942.14
5. Step 5: Solve for x
   x = 10,317,942.14/3,699.53
6. Step 6: Final answer
   x = 2,788.99