Finding the Fourth Proportional to 21,366.30, 29,491.72 and 12,417.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,366.30 : 29,491.72 = 12,417.82 : x
2. Step 2: Convert to fraction form
   21,366.30/29,491.72 = 12,417.82/x
3. Step 3: Cross multiply
   21,366.30x = 29,491.72 × 12,417.82
4. Step 4: Simplify right side
   21,366.30x = 366,222,870.45
5. Step 5: Solve for x
   x = 366,222,870.45/21,366.30
6. Step 6: Final answer
   x = 17,140.21