Finding the Fourth Proportional to 115,042.78, 172,564.20 and 31,936.78

Step by Step Solution

1. Step 1: Write the proportion equation
   115,042.78 : 172,564.20 = 31,936.78 : x
2. Step 2: Convert to fraction form
   115,042.78/172,564.20 = 31,936.78/x
3. Step 3: Cross multiply
   115,042.78x = 172,564.20 × 31,936.78
4. Step 4: Simplify right side
   115,042.78x = 5,511,144,891.28
5. Step 5: Solve for x
   x = 5,511,144,891.28/115,042.78
6. Step 6: Final answer
   x = 47,905.18