Finding the Fourth Proportional to 1,680.12, 2,318.54 and 934.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,680.12 : 2,318.54 = 934.07 : x
2. Step 2: Convert to fraction form
   1,680.12/2,318.54 = 934.07/x
3. Step 3: Cross multiply
   1,680.12x = 2,318.54 × 934.07
4. Step 4: Simplify right side
   1,680.12x = 2,165,662.39
5. Step 5: Solve for x
   x = 2,165,662.39/1,680.12
6. Step 6: Final answer
   x = 1,288.99