Finding the Fourth Proportional to 81,056.98, 121,519.86 and 31,111.57

Step by Step Solution

1. Step 1: Write the proportion equation
   81,056.98 : 121,519.86 = 31,111.57 : x
2. Step 2: Convert to fraction form
   81,056.98/121,519.86 = 31,111.57/x
3. Step 3: Cross multiply
   81,056.98x = 121,519.86 × 31,111.57
4. Step 4: Simplify right side
   81,056.98x = 3,780,673,630.78
5. Step 5: Solve for x
   x = 3,780,673,630.78/81,056.98
6. Step 6: Final answer
   x = 46,642.17