Finding the Fourth Proportional to 2,131.87, 2,941.96 and 1,187.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.87 : 2,941.96 = 1,187.67 : x
2. Step 2: Convert to fraction form
   2,131.87/2,941.96 = 1,187.67/x
3. Step 3: Cross multiply
   2,131.87x = 2,941.96 × 1,187.67
4. Step 4: Simplify right side
   2,131.87x = 3,494,073.25
5. Step 5: Solve for x
   x = 3,494,073.25/2,131.87
6. Step 6: Final answer
   x = 1,638.97