Finding the Fourth Proportional to 2,072.43, 2,859.96 and 1,188.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.43 : 2,859.96 = 1,188.30 : x
2. Step 2: Convert to fraction form
   2,072.43/2,859.96 = 1,188.30/x
3. Step 3: Cross multiply
   2,072.43x = 2,859.96 × 1,188.30
4. Step 4: Simplify right side
   2,072.43x = 3,398,490.47
5. Step 5: Solve for x
   x = 3,398,490.47/2,072.43
6. Step 6: Final answer
   x = 1,639.86