Finding the Fourth Proportional to 1,079.40, 1,618.71 and 848.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079.40 : 1,618.71 = 848.75 : x
2. Step 2: Convert to fraction form
   1,079.40/1,618.71 = 848.75/x
3. Step 3: Cross multiply
   1,079.40x = 1,618.71 × 848.75
4. Step 4: Simplify right side
   1,079.40x = 1,373,870.43
5. Step 5: Solve for x
   x = 1,373,870.43/1,079.40
6. Step 6: Final answer
   x = 1,272.80