Finding the Fourth Proportional to 2,151.50, 3,227.71 and 691.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,151.50 : 3,227.71 = 691.68 : x
2. Step 2: Convert to fraction form
   2,151.50/3,227.71 = 691.68/x
3. Step 3: Cross multiply
   2,151.50x = 3,227.71 × 691.68
4. Step 4: Simplify right side
   2,151.50x = 2,232,543.32
5. Step 5: Solve for x
   x = 2,232,543.32/2,151.50
6. Step 6: Final answer
   x = 1,037.67