Finding the Fourth Proportional to 1,680.81, 2,319.15 and 934.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,680.81 : 2,319.15 = 934.61 : x
2. Step 2: Convert to fraction form
   1,680.81/2,319.15 = 934.61/x
3. Step 3: Cross multiply
   1,680.81x = 2,319.15 × 934.61
4. Step 4: Simplify right side
   1,680.81x = 2,167,500.78
5. Step 5: Solve for x
   x = 2,167,500.78/1,680.81
6. Step 6: Final answer
   x = 1,289.56