Finding the Fourth Proportional to 1,680.50, 2,518.17 and 706.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,680.50 : 2,518.17 = 706.07 : x
2. Step 2: Convert to fraction form
   1,680.50/2,518.17 = 706.07/x
3. Step 3: Cross multiply
   1,680.50x = 2,518.17 × 706.07
4. Step 4: Simplify right side
   1,680.50x = 1,777,991.70
5. Step 5: Solve for x
   x = 1,777,991.70/1,680.50
6. Step 6: Final answer
   x = 1,058.02