Finding the Fourth Proportional to 1,170.80, 1,615.72 and 646.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,170.80 : 1,615.72 = 646.83 : x
2. Step 2: Convert to fraction form
   1,170.80/1,615.72 = 646.83/x
3. Step 3: Cross multiply
   1,170.80x = 1,615.72 × 646.83
4. Step 4: Simplify right side
   1,170.80x = 1,045,096.17
5. Step 5: Solve for x
   x = 1,045,096.17/1,170.80
6. Step 6: Final answer
   x = 892.63