Finding the Fourth Proportional to 2,380.32, 3,570.45 and 819.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,380.32 : 3,570.45 = 819.60 : x
2. Step 2: Convert to fraction form
   2,380.32/3,570.45 = 819.60/x
3. Step 3: Cross multiply
   2,380.32x = 3,570.45 × 819.60
4. Step 4: Simplify right side
   2,380.32x = 2,926,340.82
5. Step 5: Solve for x
   x = 2,926,340.82/2,380.32
6. Step 6: Final answer
   x = 1,229.39