Finding the Fourth Proportional to 1,208.64, 1,663.71 and 1,053.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208.64 : 1,663.71 = 1,053.12 : x
2. Step 2: Convert to fraction form
   1,208.64/1,663.71 = 1,053.12/x
3. Step 3: Cross multiply
   1,208.64x = 1,663.71 × 1,053.12
4. Step 4: Simplify right side
   1,208.64x = 1,752,086.28
5. Step 5: Solve for x
   x = 1,752,086.28/1,208.64
6. Step 6: Final answer
   x = 1,449.63