Finding the Fourth Proportional to 12,039.48, 18,054.73 and 4,139.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,039.48 : 18,054.73 = 4,139.76 : x
2. Step 2: Convert to fraction form
   12,039.48/18,054.73 = 4,139.76/x
3. Step 3: Cross multiply
   12,039.48x = 18,054.73 × 4,139.76
4. Step 4: Simplify right side
   12,039.48x = 74,742,333.59
5. Step 5: Solve for x
   x = 74,742,333.59/12,039.48
6. Step 6: Final answer
   x = 6,208.10