Finding the Fourth Proportional to 1,079.47, 1,489.71 and 607.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079.47 : 1,489.71 = 607.42 : x
2. Step 2: Convert to fraction form
   1,079.47/1,489.71 = 607.42/x
3. Step 3: Cross multiply
   1,079.47x = 1,489.71 × 607.42
4. Step 4: Simplify right side
   1,079.47x = 904,879.65
5. Step 5: Solve for x
   x = 904,879.65/1,079.47
6. Step 6: Final answer
   x = 838.26