Finding the Fourth Proportional to 1,015.32, 1,513.23 and 819.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.32 : 1,513.23 = 819.48 : x
2. Step 2: Convert to fraction form
   1,015.32/1,513.23 = 819.48/x
3. Step 3: Cross multiply
   1,015.32x = 1,513.23 × 819.48
4. Step 4: Simplify right side
   1,015.32x = 1,240,061.72
5. Step 5: Solve for x
   x = 1,240,061.72/1,015.32
6. Step 6: Final answer
   x = 1,221.35