Finding the Fourth Proportional to 12,199.55, 18,297.68 and 3,315.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,199.55 : 18,297.68 = 3,315.56 : x
2. Step 2: Convert to fraction form
   12,199.55/18,297.68 = 3,315.56/x
3. Step 3: Cross multiply
   12,199.55x = 18,297.68 × 3,315.56
4. Step 4: Simplify right side
   12,199.55x = 60,666,947.83
5. Step 5: Solve for x
   x = 60,666,947.83/12,199.55
6. Step 6: Final answer
   x = 4,972.89