Finding the Fourth Proportional to 123,306.06, 185,017.59 and 85,413.60

Step by Step Solution

1. Step 1: Write the proportion equation
   123,306.06 : 185,017.59 = 85,413.60 : x
2. Step 2: Convert to fraction form
   123,306.06/185,017.59 = 85,413.60/x
3. Step 3: Cross multiply
   123,306.06x = 185,017.59 × 85,413.60
4. Step 4: Simplify right side
   123,306.06x = 15,803,018,425.22
5. Step 5: Solve for x
   x = 15,803,018,425.22/123,306.06
6. Step 6: Final answer
   x = 128,160.92