Finding the Fourth Proportional to 31,954.72, 47,923.76 and 13,240

Step by Step Solution

1. Step 1: Write the proportion equation
   31,954.72 : 47,923.76 = 13,240 : x
2. Step 2: Convert to fraction form
   31,954.72/47,923.76 = 13,240/x
3. Step 3: Cross multiply
   31,954.72x = 47,923.76 × 13,240
4. Step 4: Simplify right side
   31,954.72x = 634,510,582.40
5. Step 5: Solve for x
   x = 634,510,582.40/31,954.72
6. Step 6: Final answer
   x = 19,856.55