Finding the Fourth Proportional to 21,820.08, 30,114.52 and 13,320.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,820.08 : 30,114.52 = 13,320.42 : x
2. Step 2: Convert to fraction form
   21,820.08/30,114.52 = 13,320.42/x
3. Step 3: Cross multiply
   21,820.08x = 30,114.52 × 13,320.42
4. Step 4: Simplify right side
   21,820.08x = 401,138,054.50
5. Step 5: Solve for x
   x = 401,138,054.50/21,820.08
6. Step 6: Final answer
   x = 18,383.89