Finding the Fourth Proportional to 85,805.50, 128,727.69 and 30,401.50

Step by Step Solution

1. Step 1: Write the proportion equation
   85,805.50 : 128,727.69 = 30,401.50 : x
2. Step 2: Convert to fraction form
   85,805.50/128,727.69 = 30,401.50/x
3. Step 3: Cross multiply
   85,805.50x = 128,727.69 × 30,401.50
4. Step 4: Simplify right side
   85,805.50x = 3,913,514,867.54
5. Step 5: Solve for x
   x = 3,913,514,867.54/85,805.50
6. Step 6: Final answer
   x = 45,609.14