Finding the Fourth Proportional to 12,185.12, 18,276.02 and 3,420.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,185.12 : 18,276.02 = 3,420.72 : x
2. Step 2: Convert to fraction form
   12,185.12/18,276.02 = 3,420.72/x
3. Step 3: Cross multiply
   12,185.12x = 18,276.02 × 3,420.72
4. Step 4: Simplify right side
   12,185.12x = 62,517,147.13
5. Step 5: Solve for x
   x = 62,517,147.13/12,185.12
6. Step 6: Final answer
   x = 5,130.61