Finding the Fourth Proportional to 1,605.71, 2,215.39 and 1,429.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,605.71 : 2,215.39 = 1,429.33 : x
2. Step 2: Convert to fraction form
   1,605.71/2,215.39 = 1,429.33/x
3. Step 3: Cross multiply
   1,605.71x = 2,215.39 × 1,429.33
4. Step 4: Simplify right side
   1,605.71x = 3,166,523.39
5. Step 5: Solve for x
   x = 3,166,523.39/1,605.71
6. Step 6: Final answer
   x = 1,972.04