Finding the Fourth Proportional to 1,209.83, 1,670.01 and 712.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,209.83 : 1,670.01 = 712.49 : x
2. Step 2: Convert to fraction form
   1,209.83/1,670.01 = 712.49/x
3. Step 3: Cross multiply
   1,209.83x = 1,670.01 × 712.49
4. Step 4: Simplify right side
   1,209.83x = 1,189,857.07
5. Step 5: Solve for x
   x = 1,189,857.07/1,209.83
6. Step 6: Final answer
   x = 983.50