Finding the Fourth Proportional to 3,498.78, 5,243.70 and 1,856.10

Step by Step Solution

1. Step 1: Write the proportion equation
   3,498.78 : 5,243.70 = 1,856.10 : x
2. Step 2: Convert to fraction form
   3,498.78/5,243.70 = 1,856.10/x
3. Step 3: Cross multiply
   3,498.78x = 5,243.70 × 1,856.10
4. Step 4: Simplify right side
   3,498.78x = 9,732,831.57
5. Step 5: Solve for x
   x = 9,732,831.57/3,498.78
6. Step 6: Final answer
   x = 2,781.78