Finding the Fourth Proportional to 1,077.93, 1,487.58 and 636.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,077.93 : 1,487.58 = 636.21 : x
2. Step 2: Convert to fraction form
   1,077.93/1,487.58 = 636.21/x
3. Step 3: Cross multiply
   1,077.93x = 1,487.58 × 636.21
4. Step 4: Simplify right side
   1,077.93x = 946,413.27
5. Step 5: Solve for x
   x = 946,413.27/1,077.93
6. Step 6: Final answer
   x = 877.99