Finding the Fourth Proportional to 21,575, 29,774.22 and 13,189.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,575 : 29,774.22 = 13,189.88 : x
2. Step 2: Convert to fraction form
   21,575/29,774.22 = 13,189.88/x
3. Step 3: Cross multiply
   21,575x = 29,774.22 × 13,189.88
4. Step 4: Simplify right side
   21,575x = 392,718,388.89
5. Step 5: Solve for x
   x = 392,718,388.89/21,575
6. Step 6: Final answer
   x = 18,202.47