Finding the Fourth Proportional to 2,162.46, 2,984.79 and 1,278.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,162.46 : 2,984.79 = 1,278.30 : x
2. Step 2: Convert to fraction form
   2,162.46/2,984.79 = 1,278.30/x
3. Step 3: Cross multiply
   2,162.46x = 2,984.79 × 1,278.30
4. Step 4: Simplify right side
   2,162.46x = 3,815,457.06
5. Step 5: Solve for x
   x = 3,815,457.06/2,162.46
6. Step 6: Final answer
   x = 1,764.41