Finding the Fourth Proportional to 1,216.50, 1,678.56 and 719.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.50 : 1,678.56 = 719.10 : x
2. Step 2: Convert to fraction form
   1,216.50/1,678.56 = 719.10/x
3. Step 3: Cross multiply
   1,216.50x = 1,678.56 × 719.10
4. Step 4: Simplify right side
   1,216.50x = 1,207,052.50
5. Step 5: Solve for x
   x = 1,207,052.50/1,216.50
6. Step 6: Final answer
   x = 992.23