Finding the Fourth Proportional to 85,672.72, 128,567.22 and 30,268.72

Step by Step Solution

1. Step 1: Write the proportion equation
   85,672.72 : 128,567.22 = 30,268.72 : x
2. Step 2: Convert to fraction form
   85,672.72/128,567.22 = 30,268.72/x
3. Step 3: Cross multiply
   85,672.72x = 128,567.22 × 30,268.72
4. Step 4: Simplify right side
   85,672.72x = 3,891,565,183.36
5. Step 5: Solve for x
   x = 3,891,565,183.36/85,672.72
6. Step 6: Final answer
   x = 45,423.62