Finding the Fourth Proportional to 1,389.74, 1,919.50 and 1,016.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.74 : 1,919.50 = 1,016.12 : x
2. Step 2: Convert to fraction form
   1,389.74/1,919.50 = 1,016.12/x
3. Step 3: Cross multiply
   1,389.74x = 1,919.50 × 1,016.12
4. Step 4: Simplify right side
   1,389.74x = 1,950,442.34
5. Step 5: Solve for x
   x = 1,950,442.34/1,389.74
6. Step 6: Final answer
   x = 1,403.46