Finding the Fourth Proportional to 2,101.21, 3,152.43 and 868.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,101.21 : 3,152.43 = 868.69 : x
2. Step 2: Convert to fraction form
   2,101.21/3,152.43 = 868.69/x
3. Step 3: Cross multiply
   2,101.21x = 3,152.43 × 868.69
4. Step 4: Simplify right side
   2,101.21x = 2,738,476.54
5. Step 5: Solve for x
   x = 2,738,476.54/2,101.21
6. Step 6: Final answer
   x = 1,303.29