Finding the Fourth Proportional to 1,918.88, 2,648.31 and 1,079.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,918.88 : 2,648.31 = 1,079.91 : x
2. Step 2: Convert to fraction form
   1,918.88/2,648.31 = 1,079.91/x
3. Step 3: Cross multiply
   1,918.88x = 2,648.31 × 1,079.91
4. Step 4: Simplify right side
   1,918.88x = 2,859,936.45
5. Step 5: Solve for x
   x = 2,859,936.45/1,918.88
6. Step 6: Final answer
   x = 1,490.42