Finding the Fourth Proportional to 23,128.80, 31,917.71 and 12,518.42

Step by Step Solution

1. Step 1: Write the proportion equation
   23,128.80 : 31,917.71 = 12,518.42 : x
2. Step 2: Convert to fraction form
   23,128.80/31,917.71 = 12,518.42/x
3. Step 3: Cross multiply
   23,128.80x = 31,917.71 × 12,518.42
4. Step 4: Simplify right side
   23,128.80x = 399,559,077.04
5. Step 5: Solve for x
   x = 399,559,077.04/23,128.80
6. Step 6: Final answer
   x = 17,275.39