Finding the Fourth Proportional to 23,009.20, 31,756.06 and 12,938.47

Step by Step Solution

1. Step 1: Write the proportion equation
   23,009.20 : 31,756.06 = 12,938.47 : x
2. Step 2: Convert to fraction form
   23,009.20/31,756.06 = 12,938.47/x
3. Step 3: Cross multiply
   23,009.20x = 31,756.06 × 12,938.47
4. Step 4: Simplify right side
   23,009.20x = 410,874,829.63
5. Step 5: Solve for x
   x = 410,874,829.63/23,009.20
6. Step 6: Final answer
   x = 17,856.98