Finding the Fourth Proportional to 81,896.72, 122,844.68 and 31,981.89

Step by Step Solution

1. Step 1: Write the proportion equation
   81,896.72 : 122,844.68 = 31,981.89 : x
2. Step 2: Convert to fraction form
   81,896.72/122,844.68 = 31,981.89/x
3. Step 3: Cross multiply
   81,896.72x = 122,844.68 × 31,981.89
4. Step 4: Simplify right side
   81,896.72x = 3,928,804,882.94
5. Step 5: Solve for x
   x = 3,928,804,882.94/81,896.72
6. Step 6: Final answer
   x = 47,972.68