Finding the Fourth Proportional to 2,643.84, 3,654.72 and 2,021.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,643.84 : 3,654.72 = 2,021.76 : x
2. Step 2: Convert to fraction form
   2,643.84/3,654.72 = 2,021.76/x
3. Step 3: Cross multiply
   2,643.84x = 3,654.72 × 2,021.76
4. Step 4: Simplify right side
   2,643.84x = 7,388,966.71
5. Step 5: Solve for x
   x = 7,388,966.71/2,643.84
6. Step 6: Final answer
   x = 2,794.79