Finding the Fourth Proportional to 21,575.67, 29,774.39 and 12,621.43

Step by Step Solution

1. Step 1: Write the proportion equation
   21,575.67 : 29,774.39 = 12,621.43 : x
2. Step 2: Convert to fraction form
   21,575.67/29,774.39 = 12,621.43/x
3. Step 3: Cross multiply
   21,575.67x = 29,774.39 × 12,621.43
4. Step 4: Simplify right side
   21,575.67x = 375,795,269.55
5. Step 5: Solve for x
   x = 375,795,269.55/21,575.67
6. Step 6: Final answer
   x = 17,417.54