Finding the Fourth Proportional to 3,643.90, 5,028.56 and 2,072.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,643.90 : 5,028.56 = 2,072.30 : x
2. Step 2: Convert to fraction form
   3,643.90/5,028.56 = 2,072.30/x
3. Step 3: Cross multiply
   3,643.90x = 5,028.56 × 2,072.30
4. Step 4: Simplify right side
   3,643.90x = 10,420,684.89
5. Step 5: Solve for x
   x = 10,420,684.89/3,643.90
6. Step 6: Final answer
   x = 2,859.76