Finding the Fourth Proportional to 31,050.72, 42,822 and 20,436.48

Step by Step Solution

1. Step 1: Write the proportion equation
   31,050.72 : 42,822 = 20,436.48 : x
2. Step 2: Convert to fraction form
   31,050.72/42,822 = 20,436.48/x
3. Step 3: Cross multiply
   31,050.72x = 42,822 × 20,436.48
4. Step 4: Simplify right side
   31,050.72x = 875,130,946.56
5. Step 5: Solve for x
   x = 875,130,946.56/31,050.72
6. Step 6: Final answer
   x = 28,183.92