Finding the Fourth Proportional to 2,261.49, 3,120.77 and 1,317.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,261.49 : 3,120.77 = 1,317.31 : x
2. Step 2: Convert to fraction form
   2,261.49/3,120.77 = 1,317.31/x
3. Step 3: Cross multiply
   2,261.49x = 3,120.77 × 1,317.31
4. Step 4: Simplify right side
   2,261.49x = 4,111,014.94
5. Step 5: Solve for x
   x = 4,111,014.94/2,261.49
6. Step 6: Final answer
   x = 1,817.83