Finding the Fourth Proportional to 85,671.72, 128,565.72 and 30,267.72

Step by Step Solution

1. Step 1: Write the proportion equation
   85,671.72 : 128,565.72 = 30,267.72 : x
2. Step 2: Convert to fraction form
   85,671.72/128,565.72 = 30,267.72/x
3. Step 3: Cross multiply
   85,671.72x = 128,565.72 × 30,267.72
4. Step 4: Simplify right side
   85,671.72x = 3,891,391,214.56
5. Step 5: Solve for x
   x = 3,891,391,214.56/85,671.72
6. Step 6: Final answer
   x = 45,422.12