Finding the Fourth Proportional to 16,989.90, 23,445.43 and 9,436.72

Step by Step Solution

1. Step 1: Write the proportion equation
   16,989.90 : 23,445.43 = 9,436.72 : x
2. Step 2: Convert to fraction form
   16,989.90/23,445.43 = 9,436.72/x
3. Step 3: Cross multiply
   16,989.90x = 23,445.43 × 9,436.72
4. Step 4: Simplify right side
   16,989.90x = 221,247,973.03
5. Step 5: Solve for x
   x = 221,247,973.03/16,989.90
6. Step 6: Final answer
   x = 13,022.32