Finding the Fourth Proportional to 21,748.29, 32,572.86 and 12,965.05

Step by Step Solution

1. Step 1: Write the proportion equation
   21,748.29 : 32,572.86 = 12,965.05 : x
2. Step 2: Convert to fraction form
   21,748.29/32,572.86 = 12,965.05/x
3. Step 3: Cross multiply
   21,748.29x = 32,572.86 × 12,965.05
4. Step 4: Simplify right side
   21,748.29x = 422,308,758.54
5. Step 5: Solve for x
   x = 422,308,758.54/21,748.29
6. Step 6: Final answer
   x = 19,418.02