Finding the Fourth Proportional to 21,171.30, 31,738.73 and 10,783.05

Step by Step Solution

1. Step 1: Write the proportion equation
   21,171.30 : 31,738.73 = 10,783.05 : x
2. Step 2: Convert to fraction form
   21,171.30/31,738.73 = 10,783.05/x
3. Step 3: Cross multiply
   21,171.30x = 31,738.73 × 10,783.05
4. Step 4: Simplify right side
   21,171.30x = 342,240,258.61
5. Step 5: Solve for x
   x = 342,240,258.61/21,171.30
6. Step 6: Final answer
   x = 16,165.29