Finding the Fourth Proportional to 1,680.30, 2,520.72 and 756.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,680.30 : 2,520.72 = 756.18 : x
2. Step 2: Convert to fraction form
   1,680.30/2,520.72 = 756.18/x
3. Step 3: Cross multiply
   1,680.30x = 2,520.72 × 756.18
4. Step 4: Simplify right side
   1,680.30x = 1,906,118.05
5. Step 5: Solve for x
   x = 1,906,118.05/1,680.30
6. Step 6: Final answer
   x = 1,134.39