Finding the Fourth Proportional to 2,131.86, 3,198.27 and 651.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.86 : 3,198.27 = 651.21 : x
2. Step 2: Convert to fraction form
   2,131.86/3,198.27 = 651.21/x
3. Step 3: Cross multiply
   2,131.86x = 3,198.27 × 651.21
4. Step 4: Simplify right side
   2,131.86x = 2,082,757.40
5. Step 5: Solve for x
   x = 2,082,757.40/2,131.86
6. Step 6: Final answer
   x = 976.97