Finding the Fourth Proportional to 13,139.42, 18,140.56 and 8,362.04

Step by Step Solution

1. Step 1: Write the proportion equation
   13,139.42 : 18,140.56 = 8,362.04 : x
2. Step 2: Convert to fraction form
   13,139.42/18,140.56 = 8,362.04/x
3. Step 3: Cross multiply
   13,139.42x = 18,140.56 × 8,362.04
4. Step 4: Simplify right side
   13,139.42x = 151,691,976.73
5. Step 5: Solve for x
   x = 151,691,976.73/13,139.42
6. Step 6: Final answer
   x = 11,544.80