Finding the Fourth Proportional to 12,485.02, 18,728.06 and 4,165.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,485.02 : 18,728.06 = 4,165.31 : x
2. Step 2: Convert to fraction form
   12,485.02/18,728.06 = 4,165.31/x
3. Step 3: Cross multiply
   12,485.02x = 18,728.06 × 4,165.31
4. Step 4: Simplify right side
   12,485.02x = 78,008,175.60
5. Step 5: Solve for x
   x = 78,008,175.60/12,485.02
6. Step 6: Final answer
   x = 6,248.14