Finding the Fourth Proportional to 1,277.98, 1,763.56 and 718.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,277.98 : 1,763.56 = 718.54 : x
2. Step 2: Convert to fraction form
   1,277.98/1,763.56 = 718.54/x
3. Step 3: Cross multiply
   1,277.98x = 1,763.56 × 718.54
4. Step 4: Simplify right side
   1,277.98x = 1,267,188.40
5. Step 5: Solve for x
   x = 1,267,188.40/1,277.98
6. Step 6: Final answer
   x = 991.56