Finding the Fourth Proportional to 21,467.67, 29,619.77 and 12,390.81

Step by Step Solution

1. Step 1: Write the proportion equation
   21,467.67 : 29,619.77 = 12,390.81 : x
2. Step 2: Convert to fraction form
   21,467.67/29,619.77 = 12,390.81/x
3. Step 3: Cross multiply
   21,467.67x = 29,619.77 × 12,390.81
4. Step 4: Simplify right side
   21,467.67x = 367,012,942.31
5. Step 5: Solve for x
   x = 367,012,942.31/21,467.67
6. Step 6: Final answer
   x = 17,096.08