Finding the Fourth Proportional to 81,019.81, 121,517.43 and 31,123.41

Step by Step Solution

1. Step 1: Write the proportion equation
   81,019.81 : 121,517.43 = 31,123.41 : x
2. Step 2: Convert to fraction form
   81,019.81/121,517.43 = 31,123.41/x
3. Step 3: Cross multiply
   81,019.81x = 121,517.43 × 31,123.41
4. Step 4: Simplify right side
   81,019.81x = 3,782,036,796.04
5. Step 5: Solve for x
   x = 3,782,036,796.04/81,019.81
6. Step 6: Final answer
   x = 46,680.40