Finding the Fourth Proportional to 2,151.61, 3,227.20 and 690.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,151.61 : 3,227.20 = 690.37 : x
2. Step 2: Convert to fraction form
   2,151.61/3,227.20 = 690.37/x
3. Step 3: Cross multiply
   2,151.61x = 3,227.20 × 690.37
4. Step 4: Simplify right side
   2,151.61x = 2,227,962.06
5. Step 5: Solve for x
   x = 2,227,962.06/2,151.61
6. Step 6: Final answer
   x = 1,035.49