Finding the Fourth Proportional to 1,238.52, 1,710 and 1,018.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.52 : 1,710 = 1,018.20 : x
2. Step 2: Convert to fraction form
   1,238.52/1,710 = 1,018.20/x
3. Step 3: Cross multiply
   1,238.52x = 1,710 × 1,018.20
4. Step 4: Simplify right side
   1,238.52x = 1,741,122
5. Step 5: Solve for x
   x = 1,741,122/1,238.52
6. Step 6: Final answer
   x = 1,405.81