Finding the Fourth Proportional to 1,549.50, 2,138.55 and 928.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,549.50 : 2,138.55 = 928.86 : x
2. Step 2: Convert to fraction form
   1,549.50/2,138.55 = 928.86/x
3. Step 3: Cross multiply
   1,549.50x = 2,138.55 × 928.86
4. Step 4: Simplify right side
   1,549.50x = 1,986,413.55
5. Step 5: Solve for x
   x = 1,986,413.55/1,549.50
6. Step 6: Final answer
   x = 1,281.97