Finding the Fourth Proportional to 2,389.84, 3,300.48 and 1,645.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,389.84 : 3,300.48 = 1,645.72 : x
2. Step 2: Convert to fraction form
   2,389.84/3,300.48 = 1,645.72/x
3. Step 3: Cross multiply
   2,389.84x = 3,300.48 × 1,645.72
4. Step 4: Simplify right side
   2,389.84x = 5,431,665.95
5. Step 5: Solve for x
   x = 5,431,665.95/2,389.84
6. Step 6: Final answer
   x = 2,272.82