Finding the Fourth Proportional to 1,433.28, 1,978.36 and 1,238.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,433.28 : 1,978.36 = 1,238.88 : x
2. Step 2: Convert to fraction form
   1,433.28/1,978.36 = 1,238.88/x
3. Step 3: Cross multiply
   1,433.28x = 1,978.36 × 1,238.88
4. Step 4: Simplify right side
   1,433.28x = 2,450,950.64
5. Step 5: Solve for x
   x = 2,450,950.64/1,433.28
6. Step 6: Final answer
   x = 1,710.03