Finding the Fourth Proportional to 12,938.74, 19,404.04 and 8,579.32

Step by Step Solution

1. Step 1: Write the proportion equation
   12,938.74 : 19,404.04 = 8,579.32 : x
2. Step 2: Convert to fraction form
   12,938.74/19,404.04 = 8,579.32/x
3. Step 3: Cross multiply
   12,938.74x = 19,404.04 × 8,579.32
4. Step 4: Simplify right side
   12,938.74x = 166,473,468.45
5. Step 5: Solve for x
   x = 166,473,468.45/12,938.74
6. Step 6: Final answer
   x = 12,866.28