Finding the Fourth Proportional to 20,783.73, 31,112.55 and 13,393.47

Step by Step Solution

1. Step 1: Write the proportion equation
   20,783.73 : 31,112.55 = 13,393.47 : x
2. Step 2: Convert to fraction form
   20,783.73/31,112.55 = 13,393.47/x
3. Step 3: Cross multiply
   20,783.73x = 31,112.55 × 13,393.47
4. Step 4: Simplify right side
   20,783.73x = 416,705,005.05
5. Step 5: Solve for x
   x = 416,705,005.05/20,783.73
6. Step 6: Final answer
   x = 20,049.58