Finding the Fourth Proportional to 1,680.87, 2,320.03 and 1,018.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,680.87 : 2,320.03 = 1,018.18 : x
2. Step 2: Convert to fraction form
   1,680.87/2,320.03 = 1,018.18/x
3. Step 3: Cross multiply
   1,680.87x = 2,320.03 × 1,018.18
4. Step 4: Simplify right side
   1,680.87x = 2,362,208.15
5. Step 5: Solve for x
   x = 2,362,208.15/1,680.87
6. Step 6: Final answer
   x = 1,405.35