Finding the Fourth Proportional to 12,485.56, 18,729.42 and 5,090.54

Step by Step Solution

1. Step 1: Write the proportion equation
   12,485.56 : 18,729.42 = 5,090.54 : x
2. Step 2: Convert to fraction form
   12,485.56/18,729.42 = 5,090.54/x
3. Step 3: Cross multiply
   12,485.56x = 18,729.42 × 5,090.54
4. Step 4: Simplify right side
   12,485.56x = 95,342,861.69
5. Step 5: Solve for x
   x = 95,342,861.69/12,485.56
6. Step 6: Final answer
   x = 7,636.25