Finding the Fourth Proportional to 1,399.94, 1,929.24 and 1,006.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.94 : 1,929.24 = 1,006.28 : x
2. Step 2: Convert to fraction form
   1,399.94/1,929.24 = 1,006.28/x
3. Step 3: Cross multiply
   1,399.94x = 1,929.24 × 1,006.28
4. Step 4: Simplify right side
   1,399.94x = 1,941,355.63
5. Step 5: Solve for x
   x = 1,941,355.63/1,399.94
6. Step 6: Final answer
   x = 1,386.74