Finding the Fourth Proportional to 111,019.40, 166,043.10 and 99,258.20

Step by Step Solution

1. Step 1: Write the proportion equation
   111,019.40 : 166,043.10 = 99,258.20 : x
2. Step 2: Convert to fraction form
   111,019.40/166,043.10 = 99,258.20/x
3. Step 3: Cross multiply
   111,019.40x = 166,043.10 × 99,258.20
4. Step 4: Simplify right side
   111,019.40x = 16,481,139,228.42
5. Step 5: Solve for x
   x = 16,481,139,228.42/111,019.40
6. Step 6: Final answer
   x = 148,452.79