Finding the Fourth Proportional to 21,127.42, 31,698.78 and 9,892.54

Step by Step Solution

1. Step 1: Write the proportion equation
   21,127.42 : 31,698.78 = 9,892.54 : x
2. Step 2: Convert to fraction form
   21,127.42/31,698.78 = 9,892.54/x
3. Step 3: Cross multiply
   21,127.42x = 31,698.78 × 9,892.54
4. Step 4: Simplify right side
   21,127.42x = 313,581,449.10
5. Step 5: Solve for x
   x = 313,581,449.10/21,127.42
6. Step 6: Final answer
   x = 14,842.39