Finding the Fourth Proportional to 1,087.29, 1,619.33 and 1,031.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.29 : 1,619.33 = 1,031.40 : x
2. Step 2: Convert to fraction form
   1,087.29/1,619.33 = 1,031.40/x
3. Step 3: Cross multiply
   1,087.29x = 1,619.33 × 1,031.40
4. Step 4: Simplify right side
   1,087.29x = 1,670,171.81
5. Step 5: Solve for x
   x = 1,670,171.81/1,087.29
6. Step 6: Final answer
   x = 1,536.09