Finding the Fourth Proportional to 1,162.51, 1,603.81 and 664.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,162.51 : 1,603.81 = 664.88 : x
2. Step 2: Convert to fraction form
   1,162.51/1,603.81 = 664.88/x
3. Step 3: Cross multiply
   1,162.51x = 1,603.81 × 664.88
4. Step 4: Simplify right side
   1,162.51x = 1,066,348.47
5. Step 5: Solve for x
   x = 1,066,348.47/1,162.51
6. Step 6: Final answer
   x = 917.28