Finding the Fourth Proportional to 1,680.67, 2,319.52 and 934.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,680.67 : 2,319.52 = 934.70 : x
2. Step 2: Convert to fraction form
   1,680.67/2,319.52 = 934.70/x
3. Step 3: Cross multiply
   1,680.67x = 2,319.52 × 934.70
4. Step 4: Simplify right side
   1,680.67x = 2,168,055.34
5. Step 5: Solve for x
   x = 2,168,055.34/1,680.67
6. Step 6: Final answer
   x = 1,289.99