Finding the Fourth Proportional to 1,348.36, 2,017.72 and 978.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,348.36 : 2,017.72 = 978.60 : x
2. Step 2: Convert to fraction form
   1,348.36/2,017.72 = 978.60/x
3. Step 3: Cross multiply
   1,348.36x = 2,017.72 × 978.60
4. Step 4: Simplify right side
   1,348.36x = 1,974,540.79
5. Step 5: Solve for x
   x = 1,974,540.79/1,348.36
6. Step 6: Final answer
   x = 1,464.40