Finding the Fourth Proportional to 10,661.34, 15,990.21 and 2,868.42

Step by Step Solution

1. Step 1: Write the proportion equation
   10,661.34 : 15,990.21 = 2,868.42 : x
2. Step 2: Convert to fraction form
   10,661.34/15,990.21 = 2,868.42/x
3. Step 3: Cross multiply
   10,661.34x = 15,990.21 × 2,868.42
4. Step 4: Simplify right side
   10,661.34x = 45,866,638.17
5. Step 5: Solve for x
   x = 45,866,638.17/10,661.34
6. Step 6: Final answer
   x = 4,302.15