Finding the Fourth Proportional to 21,196.36, 29,241.84 and 12,808

Step by Step Solution

1. Step 1: Write the proportion equation
   21,196.36 : 29,241.84 = 12,808 : x
2. Step 2: Convert to fraction form
   21,196.36/29,241.84 = 12,808/x
3. Step 3: Cross multiply
   21,196.36x = 29,241.84 × 12,808
4. Step 4: Simplify right side
   21,196.36x = 374,529,486.72
5. Step 5: Solve for x
   x = 374,529,486.72/21,196.36
6. Step 6: Final answer
   x = 17,669.52