Finding the Fourth Proportional to 21,022.07, 28,994.04 and 13,469.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,022.07 : 28,994.04 = 13,469.10 : x
2. Step 2: Convert to fraction form
   21,022.07/28,994.04 = 13,469.10/x
3. Step 3: Cross multiply
   21,022.07x = 28,994.04 × 13,469.10
4. Step 4: Simplify right side
   21,022.07x = 390,523,624.16
5. Step 5: Solve for x
   x = 390,523,624.16/21,022.07
6. Step 6: Final answer
   x = 18,576.84