Finding the Fourth Proportional to 2,151.72, 3,227.49 and 690.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,151.72 : 3,227.49 = 690.84 : x
2. Step 2: Convert to fraction form
   2,151.72/3,227.49 = 690.84/x
3. Step 3: Cross multiply
   2,151.72x = 3,227.49 × 690.84
4. Step 4: Simplify right side
   2,151.72x = 2,229,679.19
5. Step 5: Solve for x
   x = 2,229,679.19/2,151.72
6. Step 6: Final answer
   x = 1,036.23