Finding the Fourth Proportional to 10,870.20, 16,302.06 and 8,683.20

Step by Step Solution

1. Step 1: Write the proportion equation
   10,870.20 : 16,302.06 = 8,683.20 : x
2. Step 2: Convert to fraction form
   10,870.20/16,302.06 = 8,683.20/x
3. Step 3: Cross multiply
   10,870.20x = 16,302.06 × 8,683.20
4. Step 4: Simplify right side
   10,870.20x = 141,554,047.39
5. Step 5: Solve for x
   x = 141,554,047.39/10,870.20
6. Step 6: Final answer
   x = 13,022.21