Finding the Fourth Proportional to 2,147.25, 3,220.71 and 686.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,147.25 : 3,220.71 = 686.01 : x
2. Step 2: Convert to fraction form
   2,147.25/3,220.71 = 686.01/x
3. Step 3: Cross multiply
   2,147.25x = 3,220.71 × 686.01
4. Step 4: Simplify right side
   2,147.25x = 2,209,423.16
5. Step 5: Solve for x
   x = 2,209,423.16/2,147.25
6. Step 6: Final answer
   x = 1,028.96