Finding the Fourth Proportional to 3,683.79, 5,513.31 and 3,380.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,683.79 : 5,513.31 = 3,380.31 : x
2. Step 2: Convert to fraction form
   3,683.79/5,513.31 = 3,380.31/x
3. Step 3: Cross multiply
   3,683.79x = 5,513.31 × 3,380.31
4. Step 4: Simplify right side
   3,683.79x = 18,636,696.93
5. Step 5: Solve for x
   x = 18,636,696.93/3,683.79
6. Step 6: Final answer
   x = 5,059.11