Finding the Fourth Proportional to 1,216.94, 1,679.28 and 719.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.94 : 1,679.28 = 719.60 : x
2. Step 2: Convert to fraction form
   1,216.94/1,679.28 = 719.60/x
3. Step 3: Cross multiply
   1,216.94x = 1,679.28 × 719.60
4. Step 4: Simplify right side
   1,216.94x = 1,208,409.89
5. Step 5: Solve for x
   x = 1,208,409.89/1,216.94
6. Step 6: Final answer
   x = 992.99