Finding the Fourth Proportional to 2,071.92, 2,859.32 and 1,187.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.92 : 2,859.32 = 1,187.89 : x
2. Step 2: Convert to fraction form
   2,071.92/2,859.32 = 1,187.89/x
3. Step 3: Cross multiply
   2,071.92x = 2,859.32 × 1,187.89
4. Step 4: Simplify right side
   2,071.92x = 3,396,544.55
5. Step 5: Solve for x
   x = 3,396,544.55/2,071.92
6. Step 6: Final answer
   x = 1,639.32