Finding the Fourth Proportional to 2,002.80, 3,005.55 and 1,125.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,002.80 : 3,005.55 = 1,125.30 : x
2. Step 2: Convert to fraction form
   2,002.80/3,005.55 = 1,125.30/x
3. Step 3: Cross multiply
   2,002.80x = 3,005.55 × 1,125.30
4. Step 4: Simplify right side
   2,002.80x = 3,382,145.42
5. Step 5: Solve for x
   x = 3,382,145.42/2,002.80
6. Step 6: Final answer
   x = 1,688.71