Finding the Fourth Proportional to 21,467.95, 29,618.69 and 12,966.89

Step by Step Solution

1. Step 1: Write the proportion equation
   21,467.95 : 29,618.69 = 12,966.89 : x
2. Step 2: Convert to fraction form
   21,467.95/29,618.69 = 12,966.89/x
3. Step 3: Cross multiply
   21,467.95x = 29,618.69 × 12,966.89
4. Step 4: Simplify right side
   21,467.95x = 384,062,304.39
5. Step 5: Solve for x
   x = 384,062,304.39/21,467.95
6. Step 6: Final answer
   x = 17,890.03