Finding the Fourth Proportional to 3,480.86, 5,221.89 and 1,838.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,480.86 : 5,221.89 = 1,838.78 : x
2. Step 2: Convert to fraction form
   3,480.86/5,221.89 = 1,838.78/x
3. Step 3: Cross multiply
   3,480.86x = 5,221.89 × 1,838.78
4. Step 4: Simplify right side
   3,480.86x = 9,601,906.89
5. Step 5: Solve for x
   x = 9,601,906.89/3,480.86
6. Step 6: Final answer
   x = 2,758.49