Finding the Fourth Proportional to 1,388.49, 1,917.78 and 1,014.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.49 : 1,917.78 = 1,014.87 : x
2. Step 2: Convert to fraction form
   1,388.49/1,917.78 = 1,014.87/x
3. Step 3: Cross multiply
   1,388.49x = 1,917.78 × 1,014.87
4. Step 4: Simplify right side
   1,388.49x = 1,946,297.39
5. Step 5: Solve for x
   x = 1,946,297.39/1,388.49
6. Step 6: Final answer
   x = 1,401.74