Finding the Fourth Proportional to 2,150.48, 3,224.12 and 688.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,150.48 : 3,224.12 = 688.78 : x
2. Step 2: Convert to fraction form
   2,150.48/3,224.12 = 688.78/x
3. Step 3: Cross multiply
   2,150.48x = 3,224.12 × 688.78
4. Step 4: Simplify right side
   2,150.48x = 2,220,709.37
5. Step 5: Solve for x
   x = 2,220,709.37/2,150.48
6. Step 6: Final answer
   x = 1,032.66