Finding the Fourth Proportional to 2,131.96, 2,942.07 and 1,187.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.96 : 2,942.07 = 1,187.73 : x
2. Step 2: Convert to fraction form
   2,131.96/2,942.07 = 1,187.73/x
3. Step 3: Cross multiply
   2,131.96x = 2,942.07 × 1,187.73
4. Step 4: Simplify right side
   2,131.96x = 3,494,384.80
5. Step 5: Solve for x
   x = 3,494,384.80/2,131.96
6. Step 6: Final answer
   x = 1,639.05