Finding the Fourth Proportional to 1,440.27, 1,987.51 and 810.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,440.27 : 1,987.51 = 810.81 : x
2. Step 2: Convert to fraction form
   1,440.27/1,987.51 = 810.81/x
3. Step 3: Cross multiply
   1,440.27x = 1,987.51 × 810.81
4. Step 4: Simplify right side
   1,440.27x = 1,611,492.98
5. Step 5: Solve for x
   x = 1,611,492.98/1,440.27
6. Step 6: Final answer
   x = 1,118.88