Finding the Fourth Proportional to 1,031.38, 1,545.27 and 859.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,031.38 : 1,545.27 = 859.15 : x
2. Step 2: Convert to fraction form
   1,031.38/1,545.27 = 859.15/x
3. Step 3: Cross multiply
   1,031.38x = 1,545.27 × 859.15
4. Step 4: Simplify right side
   1,031.38x = 1,327,618.72
5. Step 5: Solve for x
   x = 1,327,618.72/1,031.38
6. Step 6: Final answer
   x = 1,287.23