Finding the Fourth Proportional to 1,079.30, 1,615.86 and 667.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079.30 : 1,615.86 = 667.19 : x
2. Step 2: Convert to fraction form
   1,079.30/1,615.86 = 667.19/x
3. Step 3: Cross multiply
   1,079.30x = 1,615.86 × 667.19
4. Step 4: Simplify right side
   1,079.30x = 1,078,089.67
5. Step 5: Solve for x
   x = 1,078,089.67/1,079.30
6. Step 6: Final answer
   x = 998.88