Finding the Fourth Proportional to 20,892.28, 31,349.76 and 13,855

Step by Step Solution

1. Step 1: Write the proportion equation
   20,892.28 : 31,349.76 = 13,855 : x
2. Step 2: Convert to fraction form
   20,892.28/31,349.76 = 13,855/x
3. Step 3: Cross multiply
   20,892.28x = 31,349.76 × 13,855
4. Step 4: Simplify right side
   20,892.28x = 434,350,924.80
5. Step 5: Solve for x
   x = 434,350,924.80/20,892.28
6. Step 6: Final answer
   x = 20,790.02