Finding the Fourth Proportional to 3,360.15, 5,039.60 and 1,139.00

Step by Step Solution

1. Step 1: Write the proportion equation
   3,360.15 : 5,039.60 = 1,139.00 : x
2. Step 2: Convert to fraction form
   3,360.15/5,039.60 = 1,139.00/x
3. Step 3: Cross multiply
   3,360.15x = 5,039.60 × 1,139.00
4. Step 4: Simplify right side
   3,360.15x = 5,740,073.51
5. Step 5: Solve for x
   x = 5,740,073.51/3,360.15
6. Step 6: Final answer
   x = 1,708.28