Finding the Fourth Proportional to 2,429.12, 3,642.78 and 868.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,429.12 : 3,642.78 = 868.70 : x
2. Step 2: Convert to fraction form
   2,429.12/3,642.78 = 868.70/x
3. Step 3: Cross multiply
   2,429.12x = 3,642.78 × 868.70
4. Step 4: Simplify right side
   2,429.12x = 3,164,463.14
5. Step 5: Solve for x
   x = 3,164,463.14/2,429.12
6. Step 6: Final answer
   x = 1,302.72