Finding the Fourth Proportional to 16,981.12, 23,436.74 and 9,429.90

Step by Step Solution

1. Step 1: Write the proportion equation
   16,981.12 : 23,436.74 = 9,429.90 : x
2. Step 2: Convert to fraction form
   16,981.12/23,436.74 = 9,429.90/x
3. Step 3: Cross multiply
   16,981.12x = 23,436.74 × 9,429.90
4. Step 4: Simplify right side
   16,981.12x = 221,006,050.21
5. Step 5: Solve for x
   x = 221,006,050.21/16,981.12
6. Step 6: Final answer
   x = 13,014.81