Finding the Fourth Proportional to 2,131.72, 3,198.79 and 1,208.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.72 : 3,198.79 = 1,208.32 : x
2. Step 2: Convert to fraction form
   2,131.72/3,198.79 = 1,208.32/x
3. Step 3: Cross multiply
   2,131.72x = 3,198.79 × 1,208.32
4. Step 4: Simplify right side
   2,131.72x = 3,865,155.45
5. Step 5: Solve for x
   x = 3,865,155.45/2,131.72
6. Step 6: Final answer
   x = 1,813.16