Finding the Fourth Proportional to 1,208.07, 1,665.55 and 871.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208.07 : 1,665.55 = 871.69 : x
2. Step 2: Convert to fraction form
   1,208.07/1,665.55 = 871.69/x
3. Step 3: Cross multiply
   1,208.07x = 1,665.55 × 871.69
4. Step 4: Simplify right side
   1,208.07x = 1,451,843.28
5. Step 5: Solve for x
   x = 1,451,843.28/1,208.07
6. Step 6: Final answer
   x = 1,201.79