Finding the Fourth Proportional to 21,377.31, 29,499.84 and 12,424.38

Step by Step Solution

1. Step 1: Write the proportion equation
   21,377.31 : 29,499.84 = 12,424.38 : x
2. Step 2: Convert to fraction form
   21,377.31/29,499.84 = 12,424.38/x
3. Step 3: Cross multiply
   21,377.31x = 29,499.84 × 12,424.38
4. Step 4: Simplify right side
   21,377.31x = 366,517,222.10
5. Step 5: Solve for x
   x = 366,517,222.10/21,377.31
6. Step 6: Final answer
   x = 17,145.15