Finding the Fourth Proportional to 91,456.80, 128,127 and 91,456.80

Step by Step Solution

1. Step 1: Write the proportion equation
   91,456.80 : 128,127 = 91,456.80 : x
2. Step 2: Convert to fraction form
   91,456.80/128,127 = 91,456.80/x
3. Step 3: Cross multiply
   91,456.80x = 128,127 × 91,456.80
4. Step 4: Simplify right side
   91,456.80x = 11,718,085,413.60
5. Step 5: Solve for x
   x = 11,718,085,413.60/91,456.80
6. Step 6: Final answer
   x = 128,127