Finding the Fourth Proportional to 1,831.98, 2,748.78 and 858.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,831.98 : 2,748.78 = 858.78 : x
2. Step 2: Convert to fraction form
   1,831.98/2,748.78 = 858.78/x
3. Step 3: Cross multiply
   1,831.98x = 2,748.78 × 858.78
4. Step 4: Simplify right side
   1,831.98x = 2,360,597.29
5. Step 5: Solve for x
   x = 2,360,597.29/1,831.98
6. Step 6: Final answer
   x = 1,288.55