Finding the Fourth Proportional to 3,988.82, 5,979.72 and 2,140.94

Step by Step Solution

1. Step 1: Write the proportion equation
   3,988.82 : 5,979.72 = 2,140.94 : x
2. Step 2: Convert to fraction form
   3,988.82/5,979.72 = 2,140.94/x
3. Step 3: Cross multiply
   3,988.82x = 5,979.72 × 2,140.94
4. Step 4: Simplify right side
   3,988.82x = 12,802,221.74
5. Step 5: Solve for x
   x = 12,802,221.74/3,988.82
6. Step 6: Final answer
   x = 3,209.53