Finding the Fourth Proportional to 3,443.94, 5,166.78 and 978.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,443.94 : 5,166.78 = 978.78 : x
2. Step 2: Convert to fraction form
   3,443.94/5,166.78 = 978.78/x
3. Step 3: Cross multiply
   3,443.94x = 5,166.78 × 978.78
4. Step 4: Simplify right side
   3,443.94x = 5,057,140.93
5. Step 5: Solve for x
   x = 5,057,140.93/3,443.94
6. Step 6: Final answer
   x = 1,468.42