Finding the Fourth Proportional to 1,209.84, 1,669.98 and 712.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,209.84 : 1,669.98 = 712.62 : x
2. Step 2: Convert to fraction form
   1,209.84/1,669.98 = 712.62/x
3. Step 3: Cross multiply
   1,209.84x = 1,669.98 × 712.62
4. Step 4: Simplify right side
   1,209.84x = 1,190,061.15
5. Step 5: Solve for x
   x = 1,190,061.15/1,209.84
6. Step 6: Final answer
   x = 983.65