Finding the Fourth Proportional to 12,579, 18,871.72 and 4,783.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,579 : 18,871.72 = 4,783.56 : x
2. Step 2: Convert to fraction form
   12,579/18,871.72 = 4,783.56/x
3. Step 3: Cross multiply
   12,579x = 18,871.72 × 4,783.56
4. Step 4: Simplify right side
   12,579x = 90,274,004.92
5. Step 5: Solve for x
   x = 90,274,004.92/12,579
6. Step 6: Final answer
   x = 7,176.56