Finding the Fourth Proportional to 1,039.68, 1,434.24 and 1,008

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.68 : 1,434.24 = 1,008 : x
2. Step 2: Convert to fraction form
   1,039.68/1,434.24 = 1,008/x
3. Step 3: Cross multiply
   1,039.68x = 1,434.24 × 1,008
4. Step 4: Simplify right side
   1,039.68x = 1,445,713.92
5. Step 5: Solve for x
   x = 1,445,713.92/1,039.68
6. Step 6: Final answer
   x = 1,390.54