Finding the Fourth Proportional to 2,147.99, 3,222.45 and 687.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,147.99 : 3,222.45 = 687.29 : x
2. Step 2: Convert to fraction form
   2,147.99/3,222.45 = 687.29/x
3. Step 3: Cross multiply
   2,147.99x = 3,222.45 × 687.29
4. Step 4: Simplify right side
   2,147.99x = 2,214,741.55
5. Step 5: Solve for x
   x = 2,214,741.55/2,147.99
6. Step 6: Final answer
   x = 1,031.08