Finding the Fourth Proportional to 2,188.64, 3,019.59 and 1,279.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188.64 : 3,019.59 = 1,279.94 : x
2. Step 2: Convert to fraction form
   2,188.64/3,019.59 = 1,279.94/x
3. Step 3: Cross multiply
   2,188.64x = 3,019.59 × 1,279.94
4. Step 4: Simplify right side
   2,188.64x = 3,864,878.93
5. Step 5: Solve for x
   x = 3,864,878.93/2,188.64
6. Step 6: Final answer
   x = 1,765.88