Finding the Fourth Proportional to 1,359.69, 2,039.88 and 986.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.69 : 2,039.88 = 986.28 : x
2. Step 2: Convert to fraction form
   1,359.69/2,039.88 = 986.28/x
3. Step 3: Cross multiply
   1,359.69x = 2,039.88 × 986.28
4. Step 4: Simplify right side
   1,359.69x = 2,011,888.90
5. Step 5: Solve for x
   x = 2,011,888.90/1,359.69
6. Step 6: Final answer
   x = 1,479.67