Finding the Fourth Proportional to 2,148.47, 3,223.18 and 687.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,148.47 : 3,223.18 = 687.62 : x
2. Step 2: Convert to fraction form
   2,148.47/3,223.18 = 687.62/x
3. Step 3: Cross multiply
   2,148.47x = 3,223.18 × 687.62
4. Step 4: Simplify right side
   2,148.47x = 2,216,333.88
5. Step 5: Solve for x
   x = 2,216,333.88/2,148.47
6. Step 6: Final answer
   x = 1,031.58