Finding the Fourth Proportional to 2,003.05, 3,004.17 and 687.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,003.05 : 3,004.17 = 687.70 : x
2. Step 2: Convert to fraction form
   2,003.05/3,004.17 = 687.70/x
3. Step 3: Cross multiply
   2,003.05x = 3,004.17 × 687.70
4. Step 4: Simplify right side
   2,003.05x = 2,065,967.71
5. Step 5: Solve for x
   x = 2,065,967.71/2,003.05
6. Step 6: Final answer
   x = 1,031.41