Finding the Fourth Proportional to 1,079.63, 1,489.89 and 613.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079.63 : 1,489.89 = 613.88 : x
2. Step 2: Convert to fraction form
   1,079.63/1,489.89 = 613.88/x
3. Step 3: Cross multiply
   1,079.63x = 1,489.89 × 613.88
4. Step 4: Simplify right side
   1,079.63x = 914,606.22
5. Step 5: Solve for x
   x = 914,606.22/1,079.63
6. Step 6: Final answer
   x = 847.15