Finding the Fourth Proportional to 1,680.42, 2,319 and 1,017.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,680.42 : 2,319 = 1,017.15 : x
2. Step 2: Convert to fraction form
   1,680.42/2,319 = 1,017.15/x
3. Step 3: Cross multiply
   1,680.42x = 2,319 × 1,017.15
4. Step 4: Simplify right side
   1,680.42x = 2,358,770.85
5. Step 5: Solve for x
   x = 2,358,770.85/1,680.42
6. Step 6: Final answer
   x = 1,403.68