Finding the Fourth Proportional to 2,185.10, 3,015.47 and 1,240.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.10 : 3,015.47 = 1,240.86 : x
2. Step 2: Convert to fraction form
   2,185.10/3,015.47 = 1,240.86/x
3. Step 3: Cross multiply
   2,185.10x = 3,015.47 × 1,240.86
4. Step 4: Simplify right side
   2,185.10x = 3,741,776.10
5. Step 5: Solve for x
   x = 3,741,776.10/2,185.10
6. Step 6: Final answer
   x = 1,712.40