Finding the Fourth Proportional to 21,096.07, 31,628.46 and 12,774.08

Step by Step Solution

1. Step 1: Write the proportion equation
   21,096.07 : 31,628.46 = 12,774.08 : x
2. Step 2: Convert to fraction form
   21,096.07/31,628.46 = 12,774.08/x
3. Step 3: Cross multiply
   21,096.07x = 31,628.46 × 12,774.08
4. Step 4: Simplify right side
   21,096.07x = 404,024,478.32
5. Step 5: Solve for x
   x = 404,024,478.32/21,096.07
6. Step 6: Final answer
   x = 19,151.65