Finding the Fourth Proportional to 1,203.69, 1,660.59 and 810.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,203.69 : 1,660.59 = 810.03 : x
2. Step 2: Convert to fraction form
   1,203.69/1,660.59 = 810.03/x
3. Step 3: Cross multiply
   1,203.69x = 1,660.59 × 810.03
4. Step 4: Simplify right side
   1,203.69x = 1,345,127.72
5. Step 5: Solve for x
   x = 1,345,127.72/1,203.69
6. Step 6: Final answer
   x = 1,117.50