Finding the Fourth Proportional to 21,823.55, 30,115.69 and 13,339.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,823.55 : 30,115.69 = 13,339.88 : x
2. Step 2: Convert to fraction form
   21,823.55/30,115.69 = 13,339.88/x
3. Step 3: Cross multiply
   21,823.55x = 30,115.69 × 13,339.88
4. Step 4: Simplify right side
   21,823.55x = 401,739,690.72
5. Step 5: Solve for x
   x = 401,739,690.72/21,823.55
6. Step 6: Final answer
   x = 18,408.54