Finding the Fourth Proportional to 21,096.99, 31,629.71 and 12,774.98

Step by Step Solution

1. Step 1: Write the proportion equation
   21,096.99 : 31,629.71 = 12,774.98 : x
2. Step 2: Convert to fraction form
   21,096.99/31,629.71 = 12,774.98/x
3. Step 3: Cross multiply
   21,096.99x = 31,629.71 × 12,774.98
4. Step 4: Simplify right side
   21,096.99x = 404,068,690.63
5. Step 5: Solve for x
   x = 404,068,690.63/21,096.99
6. Step 6: Final answer
   x = 19,152.91