Finding the Fourth Proportional to 2,379.81, 3,569.68 and 919.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,379.81 : 3,569.68 = 919.27 : x
2. Step 2: Convert to fraction form
   2,379.81/3,569.68 = 919.27/x
3. Step 3: Cross multiply
   2,379.81x = 3,569.68 × 919.27
4. Step 4: Simplify right side
   2,379.81x = 3,281,499.73
5. Step 5: Solve for x
   x = 3,281,499.73/2,379.81
6. Step 6: Final answer
   x = 1,378.89