Finding the Fourth Proportional to 1,440.49, 1,987.42 and 810.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,440.49 : 1,987.42 = 810.93 : x
2. Step 2: Convert to fraction form
   1,440.49/1,987.42 = 810.93/x
3. Step 3: Cross multiply
   1,440.49x = 1,987.42 × 810.93
4. Step 4: Simplify right side
   1,440.49x = 1,611,658.50
5. Step 5: Solve for x
   x = 1,611,658.50/1,440.49
6. Step 6: Final answer
   x = 1,118.83