Finding the Fourth Proportional to 123,678.32, 185,413.59 and 86,127.53

Step by Step Solution

1. Step 1: Write the proportion equation
   123,678.32 : 185,413.59 = 86,127.53 : x
2. Step 2: Convert to fraction form
   123,678.32/185,413.59 = 86,127.53/x
3. Step 3: Cross multiply
   123,678.32x = 185,413.59 × 86,127.53
4. Step 4: Simplify right side
   123,678.32x = 15,969,213,608.06
5. Step 5: Solve for x
   x = 15,969,213,608.06/123,678.32
6. Step 6: Final answer
   x = 129,118.95