Finding the Fourth Proportional to 1,014.50, 1,519.77 and 666.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,014.50 : 1,519.77 = 666.78 : x
2. Step 2: Convert to fraction form
   1,014.50/1,519.77 = 666.78/x
3. Step 3: Cross multiply
   1,014.50x = 1,519.77 × 666.78
4. Step 4: Simplify right side
   1,014.50x = 1,013,357.59
5. Step 5: Solve for x
   x = 1,013,357.59/1,014.50
6. Step 6: Final answer
   x = 998.88