Finding the Fourth Proportional to 2,380.58, 3,571.78 and 920.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,380.58 : 3,571.78 = 920.76 : x
2. Step 2: Convert to fraction form
   2,380.58/3,571.78 = 920.76/x
3. Step 3: Cross multiply
   2,380.58x = 3,571.78 × 920.76
4. Step 4: Simplify right side
   2,380.58x = 3,288,752.15
5. Step 5: Solve for x
   x = 3,288,752.15/2,380.58
6. Step 6: Final answer
   x = 1,381.49