Finding the Fourth Proportional to 81,647.87, 122,479.55 and 31,731.82

Step by Step Solution

1. Step 1: Write the proportion equation
   81,647.87 : 122,479.55 = 31,731.82 : x
2. Step 2: Convert to fraction form
   81,647.87/122,479.55 = 31,731.82/x
3. Step 3: Cross multiply
   81,647.87x = 122,479.55 × 31,731.82
4. Step 4: Simplify right side
   81,647.87x = 3,886,499,034.28
5. Step 5: Solve for x
   x = 3,886,499,034.28/81,647.87
6. Step 6: Final answer
   x = 47,600.74