Finding the Fourth Proportional to 13,144.77, 18,139.85 and 7,176.58

Step by Step Solution

1. Step 1: Write the proportion equation
   13,144.77 : 18,139.85 = 7,176.58 : x
2. Step 2: Convert to fraction form
   13,144.77/18,139.85 = 7,176.58/x
3. Step 3: Cross multiply
   13,144.77x = 18,139.85 × 7,176.58
4. Step 4: Simplify right side
   13,144.77x = 130,182,030.39
5. Step 5: Solve for x
   x = 130,182,030.39/13,144.77
6. Step 6: Final answer
   x = 9,903.71