Finding the Fourth Proportional to 2,132.09, 2,942.20 and 1,187.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,132.09 : 2,942.20 = 1,187.86 : x
2. Step 2: Convert to fraction form
   2,132.09/2,942.20 = 1,187.86/x
3. Step 3: Cross multiply
   2,132.09x = 2,942.20 × 1,187.86
4. Step 4: Simplify right side
   2,132.09x = 3,494,921.34
5. Step 5: Solve for x
   x = 3,494,921.34/2,132.09
6. Step 6: Final answer
   x = 1,639.20