Finding the Fourth Proportional to 21,216.16, 29,281.86 and 12,262.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,216.16 : 29,281.86 = 12,262.12 : x
2. Step 2: Convert to fraction form
   21,216.16/29,281.86 = 12,262.12/x
3. Step 3: Cross multiply
   21,216.16x = 29,281.86 × 12,262.12
4. Step 4: Simplify right side
   21,216.16x = 359,057,681.14
5. Step 5: Solve for x
   x = 359,057,681.14/21,216.16
6. Step 6: Final answer
   x = 16,923.78