Finding the Fourth Proportional to 21,280.30, 31,919.83 and 5,697.92

Step by Step Solution

1. Step 1: Write the proportion equation
   21,280.30 : 31,919.83 = 5,697.92 : x
2. Step 2: Convert to fraction form
   21,280.30/31,919.83 = 5,697.92/x
3. Step 3: Cross multiply
   21,280.30x = 31,919.83 × 5,697.92
4. Step 4: Simplify right side
   21,280.30x = 181,876,637.75
5. Step 5: Solve for x
   x = 181,876,637.75/21,280.30
6. Step 6: Final answer
   x = 8,546.71