Finding the Fourth Proportional to 23,128.50, 31,917.42 and 12,518.13

Step by Step Solution

1. Step 1: Write the proportion equation
   23,128.50 : 31,917.42 = 12,518.13 : x
2. Step 2: Convert to fraction form
   23,128.50/31,917.42 = 12,518.13/x
3. Step 3: Cross multiply
   23,128.50x = 31,917.42 × 12,518.13
4. Step 4: Simplify right side
   23,128.50x = 399,546,412.82
5. Step 5: Solve for x
   x = 399,546,412.82/23,128.50
6. Step 6: Final answer
   x = 17,275.07