Finding the Fourth Proportional to 2,005.79, 3,008.72 and 689.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,005.79 : 3,008.72 = 689.53 : x
2. Step 2: Convert to fraction form
   2,005.79/3,008.72 = 689.53/x
3. Step 3: Cross multiply
   2,005.79x = 3,008.72 × 689.53
4. Step 4: Simplify right side
   2,005.79x = 2,074,584.21
5. Step 5: Solve for x
   x = 2,074,584.21/2,005.79
6. Step 6: Final answer
   x = 1,034.30