Finding the Fourth Proportional to 1,209.99, 1,669.72 and 712.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,209.99 : 1,669.72 = 712.52 : x
2. Step 2: Convert to fraction form
   1,209.99/1,669.72 = 712.52/x
3. Step 3: Cross multiply
   1,209.99x = 1,669.72 × 712.52
4. Step 4: Simplify right side
   1,209.99x = 1,189,696.98
5. Step 5: Solve for x
   x = 1,189,696.98/1,209.99
6. Step 6: Final answer
   x = 983.23