Finding the Fourth Proportional to 1,216.42, 1,678.98 and 1,019.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.42 : 1,678.98 = 1,019.62 : x
2. Step 2: Convert to fraction form
   1,216.42/1,678.98 = 1,019.62/x
3. Step 3: Cross multiply
   1,216.42x = 1,678.98 × 1,019.62
4. Step 4: Simplify right side
   1,216.42x = 1,711,921.59
5. Step 5: Solve for x
   x = 1,711,921.59/1,216.42
6. Step 6: Final answer
   x = 1,407.34