Finding the Fourth Proportional to 2,131.88, 2,942.21 and 1,187.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.88 : 2,942.21 = 1,187.83 : x
2. Step 2: Convert to fraction form
   2,131.88/2,942.21 = 1,187.83/x
3. Step 3: Cross multiply
   2,131.88x = 2,942.21 × 1,187.83
4. Step 4: Simplify right side
   2,131.88x = 3,494,833.17
5. Step 5: Solve for x
   x = 3,494,833.17/2,131.88
6. Step 6: Final answer
   x = 1,639.32