Finding the Fourth Proportional to 1,016.80, 1,523.52 and 978.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.80 : 1,523.52 = 978.38 : x
2. Step 2: Convert to fraction form
   1,016.80/1,523.52 = 978.38/x
3. Step 3: Cross multiply
   1,016.80x = 1,523.52 × 978.38
4. Step 4: Simplify right side
   1,016.80x = 1,490,579.59
5. Step 5: Solve for x
   x = 1,490,579.59/1,016.80
6. Step 6: Final answer
   x = 1,465.96