Finding the Fourth Proportional to 22,415.72, 30,933.41 and 12,985.16

Step by Step Solution

1. Step 1: Write the proportion equation
   22,415.72 : 30,933.41 = 12,985.16 : x
2. Step 2: Convert to fraction form
   22,415.72/30,933.41 = 12,985.16/x
3. Step 3: Cross multiply
   22,415.72x = 30,933.41 × 12,985.16
4. Step 4: Simplify right side
   22,415.72x = 401,675,058.60
5. Step 5: Solve for x
   x = 401,675,058.60/22,415.72
6. Step 6: Final answer
   x = 17,919.35