Finding the Fourth Proportional to 1,388.66, 2,083.86 and 739.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.66 : 2,083.86 = 739.82 : x
2. Step 2: Convert to fraction form
   1,388.66/2,083.86 = 739.82/x
3. Step 3: Cross multiply
   1,388.66x = 2,083.86 × 739.82
4. Step 4: Simplify right side
   1,388.66x = 1,541,681.31
5. Step 5: Solve for x
   x = 1,541,681.31/1,388.66
6. Step 6: Final answer
   x = 1,110.19