Finding the Fourth Proportional to 1,172.00, 1,617.30 and 648

Step by Step Solution

1. Step 1: Write the proportion equation
   1,172.00 : 1,617.30 = 648 : x
2. Step 2: Convert to fraction form
   1,172.00/1,617.30 = 648/x
3. Step 3: Cross multiply
   1,172.00x = 1,617.30 × 648
4. Step 4: Simplify right side
   1,172.00x = 1,048,010.40
5. Step 5: Solve for x
   x = 1,048,010.40/1,172.00
6. Step 6: Final answer
   x = 894.20