Finding the Fourth Proportional to 3,857.69, 5,758.62 and 3,390.63

Step by Step Solution

1. Step 1: Write the proportion equation
   3,857.69 : 5,758.62 = 3,390.63 : x
2. Step 2: Convert to fraction form
   3,857.69/5,758.62 = 3,390.63/x
3. Step 3: Cross multiply
   3,857.69x = 5,758.62 × 3,390.63
4. Step 4: Simplify right side
   3,857.69x = 19,525,315.42
5. Step 5: Solve for x
   x = 19,525,315.42/3,857.69
6. Step 6: Final answer
   x = 5,061.40