Finding the Fourth Proportional to 111,268, 166,291.12 and 81,345.24

Step by Step Solution

1. Step 1: Write the proportion equation
   111,268 : 166,291.12 = 81,345.24 : x
2. Step 2: Convert to fraction form
   111,268/166,291.12 = 81,345.24/x
3. Step 3: Cross multiply
   111,268x = 166,291.12 × 81,345.24
4. Step 4: Simplify right side
   111,268x = 13,526,991,066.27
5. Step 5: Solve for x
   x = 13,526,991,066.27/111,268
6. Step 6: Final answer
   x = 121,571.26