Finding the Fourth Proportional to 1,440.53, 1,987.83 and 810.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,440.53 : 1,987.83 = 810.86 : x
2. Step 2: Convert to fraction form
   1,440.53/1,987.83 = 810.86/x
3. Step 3: Cross multiply
   1,440.53x = 1,987.83 × 810.86
4. Step 4: Simplify right side
   1,440.53x = 1,611,851.83
5. Step 5: Solve for x
   x = 1,611,851.83/1,440.53
6. Step 6: Final answer
   x = 1,118.93