Finding the Fourth Proportional to 2,871.05, 4,307.28 and 923.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,871.05 : 4,307.28 = 923.30 : x
2. Step 2: Convert to fraction form
   2,871.05/4,307.28 = 923.30/x
3. Step 3: Cross multiply
   2,871.05x = 4,307.28 × 923.30
4. Step 4: Simplify right side
   2,871.05x = 3,976,902.78
5. Step 5: Solve for x
   x = 3,976,902.78/2,871.05
6. Step 6: Final answer
   x = 1,385.18