Finding the Fourth Proportional to 1,439.84, 1,987.06 and 810.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.84 : 1,987.06 = 810.32 : x
2. Step 2: Convert to fraction form
   1,439.84/1,987.06 = 810.32/x
3. Step 3: Cross multiply
   1,439.84x = 1,987.06 × 810.32
4. Step 4: Simplify right side
   1,439.84x = 1,610,154.46
5. Step 5: Solve for x
   x = 1,610,154.46/1,439.84
6. Step 6: Final answer
   x = 1,118.29