Finding the Fourth Proportional to 1,212.52, 1,673.46 and 715.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,212.52 : 1,673.46 = 715.20 : x
2. Step 2: Convert to fraction form
   1,212.52/1,673.46 = 715.20/x
3. Step 3: Cross multiply
   1,212.52x = 1,673.46 × 715.20
4. Step 4: Simplify right side
   1,212.52x = 1,196,855.02
5. Step 5: Solve for x
   x = 1,196,855.02/1,212.52
6. Step 6: Final answer
   x = 987.08