Finding the Fourth Proportional to 1,440.06, 1,987.17 and 810.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,440.06 : 1,987.17 = 810.56 : x
2. Step 2: Convert to fraction form
   1,440.06/1,987.17 = 810.56/x
3. Step 3: Cross multiply
   1,440.06x = 1,987.17 × 810.56
4. Step 4: Simplify right side
   1,440.06x = 1,610,710.58
5. Step 5: Solve for x
   x = 1,610,710.58/1,440.06
6. Step 6: Final answer
   x = 1,118.50