Finding the Fourth Proportional to 2,131.78, 3,198.38 and 1,092.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.78 : 3,198.38 = 1,092.06 : x
2. Step 2: Convert to fraction form
   2,131.78/3,198.38 = 1,092.06/x
3. Step 3: Cross multiply
   2,131.78x = 3,198.38 × 1,092.06
4. Step 4: Simplify right side
   2,131.78x = 3,492,822.86
5. Step 5: Solve for x
   x = 3,492,822.86/2,131.78
6. Step 6: Final answer
   x = 1,638.45