Finding the Fourth Proportional to 111,121.49, 166,728.38 and 71,185.50

Step by Step Solution

1. Step 1: Write the proportion equation
   111,121.49 : 166,728.38 = 71,185.50 : x
2. Step 2: Convert to fraction form
   111,121.49/166,728.38 = 71,185.50/x
3. Step 3: Cross multiply
   111,121.49x = 166,728.38 × 71,185.50
4. Step 4: Simplify right side
   111,121.49x = 11,868,643,272.45
5. Step 5: Solve for x
   x = 11,868,643,272.45/111,121.49
6. Step 6: Final answer
   x = 106,807.81