Finding the Fourth Proportional to 1,831.61, 2,748.49 and 678.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,831.61 : 2,748.49 = 678.17 : x
2. Step 2: Convert to fraction form
   1,831.61/2,748.49 = 678.17/x
3. Step 3: Cross multiply
   1,831.61x = 2,748.49 × 678.17
4. Step 4: Simplify right side
   1,831.61x = 1,863,929.72
5. Step 5: Solve for x
   x = 1,863,929.72/1,831.61
6. Step 6: Final answer
   x = 1,017.65