Finding the Fourth Proportional to 1,216.27, 1,678.89 and 719.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.27 : 1,678.89 = 719.34 : x
2. Step 2: Convert to fraction form
   1,216.27/1,678.89 = 719.34/x
3. Step 3: Cross multiply
   1,216.27x = 1,678.89 × 719.34
4. Step 4: Simplify right side
   1,216.27x = 1,207,692.73
5. Step 5: Solve for x
   x = 1,207,692.73/1,216.27
6. Step 6: Final answer
   x = 992.95