Finding the Fourth Proportional to 111,315.94, 166,362.73 and 81,393.19

Step by Step Solution

1. Step 1: Write the proportion equation
   111,315.94 : 166,362.73 = 81,393.19 : x
2. Step 2: Convert to fraction form
   111,315.94/166,362.73 = 81,393.19/x
3. Step 3: Cross multiply
   111,315.94x = 166,362.73 × 81,393.19
4. Step 4: Simplify right side
   111,315.94x = 13,540,792,672.42
5. Step 5: Solve for x
   x = 13,540,792,672.42/111,315.94
6. Step 6: Final answer
   x = 121,642.89