Finding the Fourth Proportional to 1,039.67, 1,434 and 1,005.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.67 : 1,434 = 1,005.34 : x
2. Step 2: Convert to fraction form
   1,039.67/1,434 = 1,005.34/x
3. Step 3: Cross multiply
   1,039.67x = 1,434 × 1,005.34
4. Step 4: Simplify right side
   1,039.67x = 1,441,657.56
5. Step 5: Solve for x
   x = 1,441,657.56/1,039.67
6. Step 6: Final answer
   x = 1,386.66