Finding the Fourth Proportional to 3,087.86, 4,631.67 and 1,139.18

Step by Step Solution

1. Step 1: Write the proportion equation
   3,087.86 : 4,631.67 = 1,139.18 : x
2. Step 2: Convert to fraction form
   3,087.86/4,631.67 = 1,139.18/x
3. Step 3: Cross multiply
   3,087.86x = 4,631.67 × 1,139.18
4. Step 4: Simplify right side
   3,087.86x = 5,276,305.83
5. Step 5: Solve for x
   x = 5,276,305.83/3,087.86
6. Step 6: Final answer
   x = 1,708.73