Finding the Fourth Proportional to 31,513.28, 47,273.37 and 12,790.59

Step by Step Solution

1. Step 1: Write the proportion equation
   31,513.28 : 47,273.37 = 12,790.59 : x
2. Step 2: Convert to fraction form
   31,513.28/47,273.37 = 12,790.59/x
3. Step 3: Cross multiply
   31,513.28x = 47,273.37 × 12,790.59
4. Step 4: Simplify right side
   31,513.28x = 604,654,293.59
5. Step 5: Solve for x
   x = 604,654,293.59/31,513.28
6. Step 6: Final answer
   x = 19,187.29