Finding the Fourth Proportional to 81,103.82, 121,598.42 and 31,141.80

Step by Step Solution

1. Step 1: Write the proportion equation
   81,103.82 : 121,598.42 = 31,141.80 : x
2. Step 2: Convert to fraction form
   81,103.82/121,598.42 = 31,141.80/x
3. Step 3: Cross multiply
   81,103.82x = 121,598.42 × 31,141.80
4. Step 4: Simplify right side
   81,103.82x = 3,786,793,520.25
5. Step 5: Solve for x
   x = 3,786,793,520.25/81,103.82
6. Step 6: Final answer
   x = 46,690.70