Finding the Fourth Proportional to 21,379.61, 29,501.82 and 12,427.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,379.61 : 29,501.82 = 12,427.56 : x
2. Step 2: Convert to fraction form
   21,379.61/29,501.82 = 12,427.56/x
3. Step 3: Cross multiply
   21,379.61x = 29,501.82 × 12,427.56
4. Step 4: Simplify right side
   21,379.61x = 366,635,638.16
5. Step 5: Solve for x
   x = 366,635,638.16/21,379.61
6. Step 6: Final answer
   x = 17,148.84