Finding the Fourth Proportional to 3,815.30, 5,329.90 and 3,815.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,815.30 : 5,329.90 = 3,815.30 : x
2. Step 2: Convert to fraction form
   3,815.30/5,329.90 = 3,815.30/x
3. Step 3: Cross multiply
   3,815.30x = 5,329.90 × 3,815.30
4. Step 4: Simplify right side
   3,815.30x = 20,335,167.47
5. Step 5: Solve for x
   x = 20,335,167.47/3,815.30
6. Step 6: Final answer
   x = 5,329.90