Finding the Fourth Proportional to 21,570.77, 29,763.25 and 12,616.49

Step by Step Solution

1. Step 1: Write the proportion equation
   21,570.77 : 29,763.25 = 12,616.49 : x
2. Step 2: Convert to fraction form
   21,570.77/29,763.25 = 12,616.49/x
3. Step 3: Cross multiply
   21,570.77x = 29,763.25 × 12,616.49
4. Step 4: Simplify right side
   21,570.77x = 375,507,788.86
5. Step 5: Solve for x
   x = 375,507,788.86/21,570.77
6. Step 6: Final answer
   x = 17,408.18