Finding the Fourth Proportional to 2,148.84, 3,222.72 and 687.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,148.84 : 3,222.72 = 687.24 : x
2. Step 2: Convert to fraction form
   2,148.84/3,222.72 = 687.24/x
3. Step 3: Cross multiply
   2,148.84x = 3,222.72 × 687.24
4. Step 4: Simplify right side
   2,148.84x = 2,214,782.09
5. Step 5: Solve for x
   x = 2,214,782.09/2,148.84
6. Step 6: Final answer
   x = 1,030.69