Finding the Fourth Proportional to 1,578.86, 2,178.25 and 940.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,578.86 : 2,178.25 = 940.67 : x
2. Step 2: Convert to fraction form
   1,578.86/2,178.25 = 940.67/x
3. Step 3: Cross multiply
   1,578.86x = 2,178.25 × 940.67
4. Step 4: Simplify right side
   1,578.86x = 2,049,003.54
5. Step 5: Solve for x
   x = 2,049,003.54/1,578.86
6. Step 6: Final answer
   x = 1,297.78