Finding the Fourth Proportional to 81,786.06, 122,693.31 and 31,893.30

Step by Step Solution

1. Step 1: Write the proportion equation
   81,786.06 : 122,693.31 = 31,893.30 : x
2. Step 2: Convert to fraction form
   81,786.06/122,693.31 = 31,893.30/x
3. Step 3: Cross multiply
   81,786.06x = 122,693.31 × 31,893.30
4. Step 4: Simplify right side
   81,786.06x = 3,913,094,543.82
5. Step 5: Solve for x
   x = 3,913,094,543.82/81,786.06
6. Step 6: Final answer
   x = 47,845.50