Finding the Fourth Proportional to 2,539.69, 3,810.15 and 808.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,539.69 : 3,810.15 = 808.31 : x
2. Step 2: Convert to fraction form
   2,539.69/3,810.15 = 808.31/x
3. Step 3: Cross multiply
   2,539.69x = 3,810.15 × 808.31
4. Step 4: Simplify right side
   2,539.69x = 3,079,791.87
5. Step 5: Solve for x
   x = 3,079,791.87/2,539.69
6. Step 6: Final answer
   x = 1,212.67