Finding the Fourth Proportional to 12,695.31, 17,537.78 and 10,139.71

Step by Step Solution

1. Step 1: Write the proportion equation
   12,695.31 : 17,537.78 = 10,139.71 : x
2. Step 2: Convert to fraction form
   12,695.31/17,537.78 = 10,139.71/x
3. Step 3: Cross multiply
   12,695.31x = 17,537.78 × 10,139.71
4. Step 4: Simplify right side
   12,695.31x = 177,828,003.24
5. Step 5: Solve for x
   x = 177,828,003.24/12,695.31
6. Step 6: Final answer
   x = 14,007.38