Finding the Fourth Proportional to 2,131.61, 2,941.76 and 1,187.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.61 : 2,941.76 = 1,187.39 : x
2. Step 2: Convert to fraction form
   2,131.61/2,941.76 = 1,187.39/x
3. Step 3: Cross multiply
   2,131.61x = 2,941.76 × 1,187.39
4. Step 4: Simplify right side
   2,131.61x = 3,493,016.41
5. Step 5: Solve for x
   x = 3,493,016.41/2,131.61
6. Step 6: Final answer
   x = 1,638.68