Finding the Fourth Proportional to 2,103.78, 3,151.30 and 1,778.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.78 : 3,151.30 = 1,778.01 : x
2. Step 2: Convert to fraction form
   2,103.78/3,151.30 = 1,778.01/x
3. Step 3: Cross multiply
   2,103.78x = 3,151.30 × 1,778.01
4. Step 4: Simplify right side
   2,103.78x = 5,603,042.91
5. Step 5: Solve for x
   x = 5,603,042.91/2,103.78
6. Step 6: Final answer
   x = 2,663.32