Finding the Fourth Proportional to 12,908.31, 17,819.37 and 9,923.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,908.31 : 17,819.37 = 9,923.10 : x
2. Step 2: Convert to fraction form
   12,908.31/17,819.37 = 9,923.10/x
3. Step 3: Cross multiply
   12,908.31x = 17,819.37 × 9,923.10
4. Step 4: Simplify right side
   12,908.31x = 176,823,390.45
5. Step 5: Solve for x
   x = 176,823,390.45/12,908.31
6. Step 6: Final answer
   x = 13,698.42