Finding the Fourth Proportional to 2,132.78, 2,943.25 and 1,188.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,132.78 : 2,943.25 = 1,188.68 : x
2. Step 2: Convert to fraction form
   2,132.78/2,943.25 = 1,188.68/x
3. Step 3: Cross multiply
   2,132.78x = 2,943.25 × 1,188.68
4. Step 4: Simplify right side
   2,132.78x = 3,498,564.72
5. Step 5: Solve for x
   x = 3,498,564.72/2,132.78
6. Step 6: Final answer
   x = 1,640.38