Finding the Fourth Proportional to 85,608.72, 128,413.56 and 30,204.72

Step by Step Solution

1. Step 1: Write the proportion equation
   85,608.72 : 128,413.56 = 30,204.72 : x
2. Step 2: Convert to fraction form
   85,608.72/128,413.56 = 30,204.72/x
3. Step 3: Cross multiply
   85,608.72x = 128,413.56 × 30,204.72
4. Step 4: Simplify right side
   85,608.72x = 3,878,695,624.00
5. Step 5: Solve for x
   x = 3,878,695,624.00/85,608.72
6. Step 6: Final answer
   x = 45,307.25