Finding the Fourth Proportional to 3,658.30, 5,111.90 and 3,658.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,658.30 : 5,111.90 = 3,658.30 : x
2. Step 2: Convert to fraction form
   3,658.30/5,111.90 = 3,658.30/x
3. Step 3: Cross multiply
   3,658.30x = 5,111.90 × 3,658.30
4. Step 4: Simplify right side
   3,658.30x = 18,700,863.77
5. Step 5: Solve for x
   x = 18,700,863.77/3,658.30
6. Step 6: Final answer
   x = 5,111.90