Finding the Fourth Proportional to 15,086.78, 20,819.98 and 8,372.84

Step by Step Solution

1. Step 1: Write the proportion equation
   15,086.78 : 20,819.98 = 8,372.84 : x
2. Step 2: Convert to fraction form
   15,086.78/20,819.98 = 8,372.84/x
3. Step 3: Cross multiply
   15,086.78x = 20,819.98 × 8,372.84
4. Step 4: Simplify right side
   15,086.78x = 174,322,345.78
5. Step 5: Solve for x
   x = 174,322,345.78/15,086.78
6. Step 6: Final answer
   x = 11,554.64