Finding the Fourth Proportional to 2,149.86, 3,224.88 and 688.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,149.86 : 3,224.88 = 688.98 : x
2. Step 2: Convert to fraction form
   2,149.86/3,224.88 = 688.98/x
3. Step 3: Cross multiply
   2,149.86x = 3,224.88 × 688.98
4. Step 4: Simplify right side
   2,149.86x = 2,221,877.82
5. Step 5: Solve for x
   x = 2,221,877.82/2,149.86
6. Step 6: Final answer
   x = 1,033.50