Finding the Fourth Proportional to 2,072.22, 2,859.78 and 1,188.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.22 : 2,859.78 = 1,188.17 : x
2. Step 2: Convert to fraction form
   2,072.22/2,859.78 = 1,188.17/x
3. Step 3: Cross multiply
   2,072.22x = 2,859.78 × 1,188.17
4. Step 4: Simplify right side
   2,072.22x = 3,397,904.80
5. Step 5: Solve for x
   x = 3,397,904.80/2,072.22
6. Step 6: Final answer
   x = 1,639.74