Finding the Fourth Proportional to 1,665.09, 2,295.61 and 1,428.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.09 : 2,295.61 = 1,428.01 : x
2. Step 2: Convert to fraction form
   1,665.09/2,295.61 = 1,428.01/x
3. Step 3: Cross multiply
   1,665.09x = 2,295.61 × 1,428.01
4. Step 4: Simplify right side
   1,665.09x = 3,278,144.73
5. Step 5: Solve for x
   x = 3,278,144.73/1,665.09
6. Step 6: Final answer
   x = 1,968.75