Finding the Fourth Proportional to 1,079.83, 1,618.38 and 772.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079.83 : 1,618.38 = 772.28 : x
2. Step 2: Convert to fraction form
   1,079.83/1,618.38 = 772.28/x
3. Step 3: Cross multiply
   1,079.83x = 1,618.38 × 772.28
4. Step 4: Simplify right side
   1,079.83x = 1,249,849.59
5. Step 5: Solve for x
   x = 1,249,849.59/1,079.83
6. Step 6: Final answer
   x = 1,157.45