Finding the Fourth Proportional to 1,680.04, 2,318.61 and 934.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,680.04 : 2,318.61 = 934.15 : x
2. Step 2: Convert to fraction form
   1,680.04/2,318.61 = 934.15/x
3. Step 3: Cross multiply
   1,680.04x = 2,318.61 × 934.15
4. Step 4: Simplify right side
   1,680.04x = 2,165,924.86
5. Step 5: Solve for x
   x = 2,165,924.86/1,680.04
6. Step 6: Final answer
   x = 1,289.21