Finding the Fourth Proportional to 3,443.79, 5,164.65 and 978.81

Step by Step Solution

1. Step 1: Write the proportion equation
   3,443.79 : 5,164.65 = 978.81 : x
2. Step 2: Convert to fraction form
   3,443.79/5,164.65 = 978.81/x
3. Step 3: Cross multiply
   3,443.79x = 5,164.65 × 978.81
4. Step 4: Simplify right side
   3,443.79x = 5,055,211.07
5. Step 5: Solve for x
   x = 5,055,211.07/3,443.79
6. Step 6: Final answer
   x = 1,467.92