Finding the Fourth Proportional to 1,238.16, 1,706.12 and 1,016.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.16 : 1,706.12 = 1,016.40 : x
2. Step 2: Convert to fraction form
   1,238.16/1,706.12 = 1,016.40/x
3. Step 3: Cross multiply
   1,238.16x = 1,706.12 × 1,016.40
4. Step 4: Simplify right side
   1,238.16x = 1,734,100.37
5. Step 5: Solve for x
   x = 1,734,100.37/1,238.16
6. Step 6: Final answer
   x = 1,400.55