Finding the Fourth Proportional to 3,443.61, 5,164.92 and 978.66

Step by Step Solution

1. Step 1: Write the proportion equation
   3,443.61 : 5,164.92 = 978.66 : x
2. Step 2: Convert to fraction form
   3,443.61/5,164.92 = 978.66/x
3. Step 3: Cross multiply
   3,443.61x = 5,164.92 × 978.66
4. Step 4: Simplify right side
   3,443.61x = 5,054,700.61
5. Step 5: Solve for x
   x = 5,054,700.61/3,443.61
6. Step 6: Final answer
   x = 1,467.85