Finding the Fourth Proportional to 2,387.84, 3,297.71 and 1,643.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,387.84 : 3,297.71 = 1,643.72 : x
2. Step 2: Convert to fraction form
   2,387.84/3,297.71 = 1,643.72/x
3. Step 3: Cross multiply
   2,387.84x = 3,297.71 × 1,643.72
4. Step 4: Simplify right side
   2,387.84x = 5,420,499.50
5. Step 5: Solve for x
   x = 5,420,499.50/2,387.84
6. Step 6: Final answer
   x = 2,270.05