Finding the Fourth Proportional to 1,010.72, 1,503.10 and 978.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,010.72 : 1,503.10 = 978.32 : x
2. Step 2: Convert to fraction form
   1,010.72/1,503.10 = 978.32/x
3. Step 3: Cross multiply
   1,010.72x = 1,503.10 × 978.32
4. Step 4: Simplify right side
   1,010.72x = 1,470,512.79
5. Step 5: Solve for x
   x = 1,470,512.79/1,010.72
6. Step 6: Final answer
   x = 1,454.92