Finding the Fourth Proportional to 16,722.05, 23,095.94 and 12,990.78

Step by Step Solution

1. Step 1: Write the proportion equation
   16,722.05 : 23,095.94 = 12,990.78 : x
2. Step 2: Convert to fraction form
   16,722.05/23,095.94 = 12,990.78/x
3. Step 3: Cross multiply
   16,722.05x = 23,095.94 × 12,990.78
4. Step 4: Simplify right side
   16,722.05x = 300,034,210.48
5. Step 5: Solve for x
   x = 300,034,210.48/16,722.05
6. Step 6: Final answer
   x = 17,942.44