Finding the Fourth Proportional to 31,388.82, 47,086.31 and 10,320.31

Step by Step Solution

1. Step 1: Write the proportion equation
   31,388.82 : 47,086.31 = 10,320.31 : x
2. Step 2: Convert to fraction form
   31,388.82/47,086.31 = 10,320.31/x
3. Step 3: Cross multiply
   31,388.82x = 47,086.31 × 10,320.31
4. Step 4: Simplify right side
   31,388.82x = 485,945,315.96
5. Step 5: Solve for x
   x = 485,945,315.96/31,388.82
6. Step 6: Final answer
   x = 15,481.48