Finding the Fourth Proportional to 1,212.37, 1,673.00 and 715.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,212.37 : 1,673.00 = 715.28 : x
2. Step 2: Convert to fraction form
   1,212.37/1,673.00 = 715.28/x
3. Step 3: Cross multiply
   1,212.37x = 1,673.00 × 715.28
4. Step 4: Simplify right side
   1,212.37x = 1,196,667.61
5. Step 5: Solve for x
   x = 1,196,667.61/1,212.37
6. Step 6: Final answer
   x = 987.05