Finding the Fourth Proportional to 2,003.40, 2,763.78 and 1,207

Step by Step Solution

1. Step 1: Write the proportion equation
   2,003.40 : 2,763.78 = 1,207 : x
2. Step 2: Convert to fraction form
   2,003.40/2,763.78 = 1,207/x
3. Step 3: Cross multiply
   2,003.40x = 2,763.78 × 1,207
4. Step 4: Simplify right side
   2,003.40x = 3,335,882.46
5. Step 5: Solve for x
   x = 3,335,882.46/2,003.40
6. Step 6: Final answer
   x = 1,665.11