Finding the Fourth Proportional to 12,174.15, 18,271.59 and 4,783.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,174.15 : 18,271.59 = 4,783.78 : x
2. Step 2: Convert to fraction form
   12,174.15/18,271.59 = 4,783.78/x
3. Step 3: Cross multiply
   12,174.15x = 18,271.59 × 4,783.78
4. Step 4: Simplify right side
   12,174.15x = 87,407,266.81
5. Step 5: Solve for x
   x = 87,407,266.81/12,174.15
6. Step 6: Final answer
   x = 7,179.74