Finding the Fourth Proportional to 1,388.61, 2,083.69 and 739.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.61 : 2,083.69 = 739.33 : x
2. Step 2: Convert to fraction form
   1,388.61/2,083.69 = 739.33/x
3. Step 3: Cross multiply
   1,388.61x = 2,083.69 × 739.33
4. Step 4: Simplify right side
   1,388.61x = 1,540,530.24
5. Step 5: Solve for x
   x = 1,540,530.24/1,388.61
6. Step 6: Final answer
   x = 1,109.40