Finding the Fourth Proportional to 1,440.23, 1,987.42 and 810.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,440.23 : 1,987.42 = 810.68 : x
2. Step 2: Convert to fraction form
   1,440.23/1,987.42 = 810.68/x
3. Step 3: Cross multiply
   1,440.23x = 1,987.42 × 810.68
4. Step 4: Simplify right side
   1,440.23x = 1,611,147.66
5. Step 5: Solve for x
   x = 1,611,147.66/1,440.23
6. Step 6: Final answer
   x = 1,118.68