Finding the Fourth Proportional to 21,906.99, 30,231.72 and 12,475.53

Step by Step Solution

1. Step 1: Write the proportion equation
   21,906.99 : 30,231.72 = 12,475.53 : x
2. Step 2: Convert to fraction form
   21,906.99/30,231.72 = 12,475.53/x
3. Step 3: Cross multiply
   21,906.99x = 30,231.72 × 12,475.53
4. Step 4: Simplify right side
   21,906.99x = 377,156,729.81
5. Step 5: Solve for x
   x = 377,156,729.81/21,906.99
6. Step 6: Final answer
   x = 17,216.27