Finding the Fourth Proportional to 1,100.71, 1,519.50 and 708.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.71 : 1,519.50 = 708.40 : x
2. Step 2: Convert to fraction form
   1,100.71/1,519.50 = 708.40/x
3. Step 3: Cross multiply
   1,100.71x = 1,519.50 × 708.40
4. Step 4: Simplify right side
   1,100.71x = 1,076,413.80
5. Step 5: Solve for x
   x = 1,076,413.80/1,100.71
6. Step 6: Final answer
   x = 977.93