Finding the Fourth Proportional to 2,003.30, 3,005.20 and 686.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,003.30 : 3,005.20 = 686.69 : x
2. Step 2: Convert to fraction form
   2,003.30/3,005.20 = 686.69/x
3. Step 3: Cross multiply
   2,003.30x = 3,005.20 × 686.69
4. Step 4: Simplify right side
   2,003.30x = 2,063,654.79
5. Step 5: Solve for x
   x = 2,063,654.79/2,003.30
6. Step 6: Final answer
   x = 1,030.13