Finding the Fourth Proportional to 1,238.58, 1,710 and 741.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.58 : 1,710 = 741.40 : x
2. Step 2: Convert to fraction form
   1,238.58/1,710 = 741.40/x
3. Step 3: Cross multiply
   1,238.58x = 1,710 × 741.40
4. Step 4: Simplify right side
   1,238.58x = 1,267,789.73
5. Step 5: Solve for x
   x = 1,267,789.73/1,238.58
6. Step 6: Final answer
   x = 1,023.58