Finding the Fourth Proportional to 1,079.80, 1,617.27 and 646.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079.80 : 1,617.27 = 646.05 : x
2. Step 2: Convert to fraction form
   1,079.80/1,617.27 = 646.05/x
3. Step 3: Cross multiply
   1,079.80x = 1,617.27 × 646.05
4. Step 4: Simplify right side
   1,079.80x = 1,044,837.28
5. Step 5: Solve for x
   x = 1,044,837.28/1,079.80
6. Step 6: Final answer
   x = 967.62