Finding the Fourth Proportional to 2,991.57, 4,128.43 and 1,665.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,991.57 : 4,128.43 = 1,665.25 : x
2. Step 2: Convert to fraction form
   2,991.57/4,128.43 = 1,665.25/x
3. Step 3: Cross multiply
   2,991.57x = 4,128.43 × 1,665.25
4. Step 4: Simplify right side
   2,991.57x = 6,874,868.06
5. Step 5: Solve for x
   x = 6,874,868.06/2,991.57
6. Step 6: Final answer
   x = 2,298.08