Finding the Fourth Proportional to 13,142.25, 18,139.55 and 7,556.49

Step by Step Solution

1. Step 1: Write the proportion equation
   13,142.25 : 18,139.55 = 7,556.49 : x
2. Step 2: Convert to fraction form
   13,142.25/18,139.55 = 7,556.49/x
3. Step 3: Cross multiply
   13,142.25x = 18,139.55 × 7,556.49
4. Step 4: Simplify right side
   13,142.25x = 137,071,290.40
5. Step 5: Solve for x
   x = 137,071,290.40/13,142.25
6. Step 6: Final answer
   x = 10,429.82