Finding the Fourth Proportional to 2,868.56, 4,302.43 and 920.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,868.56 : 4,302.43 = 920.51 : x
2. Step 2: Convert to fraction form
   2,868.56/4,302.43 = 920.51/x
3. Step 3: Cross multiply
   2,868.56x = 4,302.43 × 920.51
4. Step 4: Simplify right side
   2,868.56x = 3,960,429.84
5. Step 5: Solve for x
   x = 3,960,429.84/2,868.56
6. Step 6: Final answer
   x = 1,380.63