Finding the Fourth Proportional to 2,149.61, 3,224.20 and 688.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,149.61 : 3,224.20 = 688.37 : x
2. Step 2: Convert to fraction form
   2,149.61/3,224.20 = 688.37/x
3. Step 3: Cross multiply
   2,149.61x = 3,224.20 × 688.37
4. Step 4: Simplify right side
   2,149.61x = 2,219,442.55
5. Step 5: Solve for x
   x = 2,219,442.55/2,149.61
6. Step 6: Final answer
   x = 1,032.49