Finding the Fourth Proportional to 1,079.30, 1,489.40 and 607.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079.30 : 1,489.40 = 607.18 : x
2. Step 2: Convert to fraction form
   1,079.30/1,489.40 = 607.18/x
3. Step 3: Cross multiply
   1,079.30x = 1,489.40 × 607.18
4. Step 4: Simplify right side
   1,079.30x = 904,333.89
5. Step 5: Solve for x
   x = 904,333.89/1,079.30
6. Step 6: Final answer
   x = 837.89