Finding the Fourth Proportional to 21,162.47, 29,210.63 and 12,216.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,162.47 : 29,210.63 = 12,216.42 : x
2. Step 2: Convert to fraction form
   21,162.47/29,210.63 = 12,216.42/x
3. Step 3: Cross multiply
   21,162.47x = 29,210.63 × 12,216.42
4. Step 4: Simplify right side
   21,162.47x = 356,849,263.46
5. Step 5: Solve for x
   x = 356,849,263.46/21,162.47
6. Step 6: Final answer
   x = 16,862.37