Finding the Fourth Proportional to 1,389.74, 2,089.06 and 1,118.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.74 : 2,089.06 = 1,118.84 : x
2. Step 2: Convert to fraction form
   1,389.74/2,089.06 = 1,118.84/x
3. Step 3: Cross multiply
   1,389.74x = 2,089.06 × 1,118.84
4. Step 4: Simplify right side
   1,389.74x = 2,337,323.89
5. Step 5: Solve for x
   x = 2,337,323.89/1,389.74
6. Step 6: Final answer
   x = 1,681.84