Finding the Fourth Proportional to 1,173.79, 1,619.72 and 649.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,173.79 : 1,619.72 = 649.69 : x
2. Step 2: Convert to fraction form
   1,173.79/1,619.72 = 649.69/x
3. Step 3: Cross multiply
   1,173.79x = 1,619.72 × 649.69
4. Step 4: Simplify right side
   1,173.79x = 1,052,309.41
5. Step 5: Solve for x
   x = 1,052,309.41/1,173.79
6. Step 6: Final answer
   x = 896.51