Finding the Fourth Proportional to 21,023.76, 29,027.61 and 13,489.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,023.76 : 29,027.61 = 13,489.50 : x
2. Step 2: Convert to fraction form
   21,023.76/29,027.61 = 13,489.50/x
3. Step 3: Cross multiply
   21,023.76x = 29,027.61 × 13,489.50
4. Step 4: Simplify right side
   21,023.76x = 391,567,945.10
5. Step 5: Solve for x
   x = 391,567,945.10/21,023.76
6. Step 6: Final answer
   x = 18,625.02