Finding the Fourth Proportional to 1,015.96, 1,522.32 and 978

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.96 : 1,522.32 = 978 : x
2. Step 2: Convert to fraction form
   1,015.96/1,522.32 = 978/x
3. Step 3: Cross multiply
   1,015.96x = 1,522.32 × 978
4. Step 4: Simplify right side
   1,015.96x = 1,488,828.96
5. Step 5: Solve for x
   x = 1,488,828.96/1,015.96
6. Step 6: Final answer
   x = 1,465.44