Finding the Fourth Proportional to 1,429.89, 2,133.14 and 1,390.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.89 : 2,133.14 = 1,390.20 : x
2. Step 2: Convert to fraction form
   1,429.89/2,133.14 = 1,390.20/x
3. Step 3: Cross multiply
   1,429.89x = 2,133.14 × 1,390.20
4. Step 4: Simplify right side
   1,429.89x = 2,965,491.23
5. Step 5: Solve for x
   x = 2,965,491.23/1,429.89
6. Step 6: Final answer
   x = 2,073.93