Finding the Fourth Proportional to 1,662.58, 2,487.15 and 1,389.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,662.58 : 2,487.15 = 1,389.22 : x
2. Step 2: Convert to fraction form
   1,662.58/2,487.15 = 1,389.22/x
3. Step 3: Cross multiply
   1,662.58x = 2,487.15 × 1,389.22
4. Step 4: Simplify right side
   1,662.58x = 3,455,198.52
5. Step 5: Solve for x
   x = 3,455,198.52/1,662.58
6. Step 6: Final answer
   x = 2,078.21