Finding the Fourth Proportional to 12,381.10, 18,571.69 and 3,147.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,381.10 : 18,571.69 = 3,147.10 : x
2. Step 2: Convert to fraction form
   12,381.10/18,571.69 = 3,147.10/x
3. Step 3: Cross multiply
   12,381.10x = 18,571.69 × 3,147.10
4. Step 4: Simplify right side
   12,381.10x = 58,446,965.60
5. Step 5: Solve for x
   x = 58,446,965.60/12,381.10
6. Step 6: Final answer
   x = 4,720.66