Finding the Fourth Proportional to 21,022.56, 28,994.73 and 13,469.58

Step by Step Solution

1. Step 1: Write the proportion equation
   21,022.56 : 28,994.73 = 13,469.58 : x
2. Step 2: Convert to fraction form
   21,022.56/28,994.73 = 13,469.58/x
3. Step 3: Cross multiply
   21,022.56x = 28,994.73 × 13,469.58
4. Step 4: Simplify right side
   21,022.56x = 390,546,835.31
5. Step 5: Solve for x
   x = 390,546,835.31/21,022.56
6. Step 6: Final answer
   x = 18,577.51