Finding the Fourth Proportional to 1,389.97, 1,918.86 and 1,074.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.97 : 1,918.86 = 1,074.52 : x
2. Step 2: Convert to fraction form
   1,389.97/1,918.86 = 1,074.52/x
3. Step 3: Cross multiply
   1,389.97x = 1,918.86 × 1,074.52
4. Step 4: Simplify right side
   1,389.97x = 2,061,848.07
5. Step 5: Solve for x
   x = 2,061,848.07/1,389.97
6. Step 6: Final answer
   x = 1,483.38