Finding the Fourth Proportional to 1,661.84, 2,493.31 and 839.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,661.84 : 2,493.31 = 839.89 : x
2. Step 2: Convert to fraction form
   1,661.84/2,493.31 = 839.89/x
3. Step 3: Cross multiply
   1,661.84x = 2,493.31 × 839.89
4. Step 4: Simplify right side
   1,661.84x = 2,094,106.14
5. Step 5: Solve for x
   x = 2,094,106.14/1,661.84
6. Step 6: Final answer
   x = 1,260.11