Finding the Fourth Proportional to 10,139.82, 15,188.54 and 8,154.71

Step by Step Solution

1. Step 1: Write the proportion equation
   10,139.82 : 15,188.54 = 8,154.71 : x
2. Step 2: Convert to fraction form
   10,139.82/15,188.54 = 8,154.71/x
3. Step 3: Cross multiply
   10,139.82x = 15,188.54 × 8,154.71
4. Step 4: Simplify right side
   10,139.82x = 123,858,197.38
5. Step 5: Solve for x
   x = 123,858,197.38/10,139.82
6. Step 6: Final answer
   x = 12,215.03