Finding the Fourth Proportional to 3,699.39, 5,105.18 and 2,020.77

Step by Step Solution

1. Step 1: Write the proportion equation
   3,699.39 : 5,105.18 = 2,020.77 : x
2. Step 2: Convert to fraction form
   3,699.39/5,105.18 = 2,020.77/x
3. Step 3: Cross multiply
   3,699.39x = 5,105.18 × 2,020.77
4. Step 4: Simplify right side
   3,699.39x = 10,316,394.59
5. Step 5: Solve for x
   x = 10,316,394.59/3,699.39
6. Step 6: Final answer
   x = 2,788.67