Finding the Fourth Proportional to 85,542.82, 128,305.59 and 30,134.50

Step by Step Solution

1. Step 1: Write the proportion equation
   85,542.82 : 128,305.59 = 30,134.50 : x
2. Step 2: Convert to fraction form
   85,542.82/128,305.59 = 30,134.50/x
3. Step 3: Cross multiply
   85,542.82x = 128,305.59 × 30,134.50
4. Step 4: Simplify right side
   85,542.82x = 3,866,424,801.86
5. Step 5: Solve for x
   x = 3,866,424,801.86/85,542.82
6. Step 6: Final answer
   x = 45,198.71