Finding the Fourth Proportional to 2,185.15, 3,015.57 and 1,240.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.15 : 3,015.57 = 1,240.91 : x
2. Step 2: Convert to fraction form
   2,185.15/3,015.57 = 1,240.91/x
3. Step 3: Cross multiply
   2,185.15x = 3,015.57 × 1,240.91
4. Step 4: Simplify right side
   2,185.15x = 3,742,044.76
5. Step 5: Solve for x
   x = 3,742,044.76/2,185.15
6. Step 6: Final answer
   x = 1,712.49