Finding the Fourth Proportional to 1,665.96, 2,293.38 and 1,431.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.96 : 2,293.38 = 1,431.72 : x
2. Step 2: Convert to fraction form
   1,665.96/2,293.38 = 1,431.72/x
3. Step 3: Cross multiply
   1,665.96x = 2,293.38 × 1,431.72
4. Step 4: Simplify right side
   1,665.96x = 3,283,478.01
5. Step 5: Solve for x
   x = 3,283,478.01/1,665.96
6. Step 6: Final answer
   x = 1,970.92