Finding the Fourth Proportional to 2,131.83, 2,941.86 and 1,187.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.83 : 2,941.86 = 1,187.63 : x
2. Step 2: Convert to fraction form
   2,131.83/2,941.86 = 1,187.63/x
3. Step 3: Cross multiply
   2,131.83x = 2,941.86 × 1,187.63
4. Step 4: Simplify right side
   2,131.83x = 3,493,826.48
5. Step 5: Solve for x
   x = 3,493,826.48/2,131.83
6. Step 6: Final answer
   x = 1,638.89