Finding the Fourth Proportional to 2,142.30, 3,209.93 and 1,318.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.30 : 3,209.93 = 1,318.84 : x
2. Step 2: Convert to fraction form
   2,142.30/3,209.93 = 1,318.84/x
3. Step 3: Cross multiply
   2,142.30x = 3,209.93 × 1,318.84
4. Step 4: Simplify right side
   2,142.30x = 4,233,379.35
5. Step 5: Solve for x
   x = 4,233,379.35/2,142.30
6. Step 6: Final answer
   x = 1,976.09