Finding the Fourth Proportional to 21,518.78, 32,280.15 and 8,372.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,518.78 : 32,280.15 = 8,372.15 : x
2. Step 2: Convert to fraction form
   21,518.78/32,280.15 = 8,372.15/x
3. Step 3: Cross multiply
   21,518.78x = 32,280.15 × 8,372.15
4. Step 4: Simplify right side
   21,518.78x = 270,254,096.42
5. Step 5: Solve for x
   x = 270,254,096.42/21,518.78
6. Step 6: Final answer
   x = 12,558.99