Finding the Fourth Proportional to 2,390.05, 3,586.43 and 929.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,390.05 : 3,586.43 = 929.31 : x
2. Step 2: Convert to fraction form
   2,390.05/3,586.43 = 929.31/x
3. Step 3: Cross multiply
   2,390.05x = 3,586.43 × 929.31
4. Step 4: Simplify right side
   2,390.05x = 3,332,905.26
5. Step 5: Solve for x
   x = 3,332,905.26/2,390.05
6. Step 6: Final answer
   x = 1,394.49