Finding the Fourth Proportional to 31,665.94, 47,481.37 and 12,959.12

Step by Step Solution

1. Step 1: Write the proportion equation
   31,665.94 : 47,481.37 = 12,959.12 : x
2. Step 2: Convert to fraction form
   31,665.94/47,481.37 = 12,959.12/x
3. Step 3: Cross multiply
   31,665.94x = 47,481.37 × 12,959.12
4. Step 4: Simplify right side
   31,665.94x = 615,316,771.59
5. Step 5: Solve for x
   x = 615,316,771.59/31,665.94
6. Step 6: Final answer
   x = 19,431.50