Finding the Fourth Proportional to 1,209.84, 1,669.59 and 712.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,209.84 : 1,669.59 = 712.38 : x
2. Step 2: Convert to fraction form
   1,209.84/1,669.59 = 712.38/x
3. Step 3: Cross multiply
   1,209.84x = 1,669.59 × 712.38
4. Step 4: Simplify right side
   1,209.84x = 1,189,382.52
5. Step 5: Solve for x
   x = 1,189,382.52/1,209.84
6. Step 6: Final answer
   x = 983.09