Finding the Fourth Proportional to 3,801.90, 5,243.61 and 2,309.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,801.90 : 5,243.61 = 2,309.78 : x
2. Step 2: Convert to fraction form
   3,801.90/5,243.61 = 2,309.78/x
3. Step 3: Cross multiply
   3,801.90x = 5,243.61 × 2,309.78
4. Step 4: Simplify right side
   3,801.90x = 12,111,559.29
5. Step 5: Solve for x
   x = 12,111,559.29/3,801.90
6. Step 6: Final answer
   x = 3,185.66