Finding the Fourth Proportional to 21,343.16, 29,456.22 and 12,388.74

Step by Step Solution

1. Step 1: Write the proportion equation
   21,343.16 : 29,456.22 = 12,388.74 : x
2. Step 2: Convert to fraction form
   21,343.16/29,456.22 = 12,388.74/x
3. Step 3: Cross multiply
   21,343.16x = 29,456.22 × 12,388.74
4. Step 4: Simplify right side
   21,343.16x = 364,925,450.96
5. Step 5: Solve for x
   x = 364,925,450.96/21,343.16
6. Step 6: Final answer
   x = 17,098.00