Finding the Fourth Proportional to 15,683.72, 21,642.18 and 8,967.20

Step by Step Solution

1. Step 1: Write the proportion equation
   15,683.72 : 21,642.18 = 8,967.20 : x
2. Step 2: Convert to fraction form
   15,683.72/21,642.18 = 8,967.20/x
3. Step 3: Cross multiply
   15,683.72x = 21,642.18 × 8,967.20
4. Step 4: Simplify right side
   15,683.72x = 194,069,756.50
5. Step 5: Solve for x
   x = 194,069,756.50/15,683.72
6. Step 6: Final answer
   x = 12,373.96