Finding the Fourth Proportional to 12,178.56, 18,267.72 and 3,858.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,178.56 : 18,267.72 = 3,858.55 : x
2. Step 2: Convert to fraction form
   12,178.56/18,267.72 = 3,858.55/x
3. Step 3: Cross multiply
   12,178.56x = 18,267.72 × 3,858.55
4. Step 4: Simplify right side
   12,178.56x = 70,486,911.01
5. Step 5: Solve for x
   x = 70,486,911.01/12,178.56
6. Step 6: Final answer
   x = 5,787.79