Finding the Fourth Proportional to 2,178.60, 3,007.86 and 1,680.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,178.60 : 3,007.86 = 1,680.32 : x
2. Step 2: Convert to fraction form
   2,178.60/3,007.86 = 1,680.32/x
3. Step 3: Cross multiply
   2,178.60x = 3,007.86 × 1,680.32
4. Step 4: Simplify right side
   2,178.60x = 5,054,167.32
5. Step 5: Solve for x
   x = 5,054,167.32/2,178.60
6. Step 6: Final answer
   x = 2,319.92