Finding the Fourth Proportional to 23,100.96, 31,879.28 and 12,490.64

Step by Step Solution

1. Step 1: Write the proportion equation
   23,100.96 : 31,879.28 = 12,490.64 : x
2. Step 2: Convert to fraction form
   23,100.96/31,879.28 = 12,490.64/x
3. Step 3: Cross multiply
   23,100.96x = 31,879.28 × 12,490.64
4. Step 4: Simplify right side
   23,100.96x = 398,192,609.94
5. Step 5: Solve for x
   x = 398,192,609.94/23,100.96
6. Step 6: Final answer
   x = 17,237.06