Finding the Fourth Proportional to 2,003.80, 3,007.05 and 1,126.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,003.80 : 3,007.05 = 1,126.30 : x
2. Step 2: Convert to fraction form
   2,003.80/3,007.05 = 1,126.30/x
3. Step 3: Cross multiply
   2,003.80x = 3,007.05 × 1,126.30
4. Step 4: Simplify right side
   2,003.80x = 3,386,840.42
5. Step 5: Solve for x
   x = 3,386,840.42/2,003.80
6. Step 6: Final answer
   x = 1,690.21