Finding the Fourth Proportional to 1,288.05, 1,776.29 and 936.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.05 : 1,776.29 = 936.29 : x
2. Step 2: Convert to fraction form
   1,288.05/1,776.29 = 936.29/x
3. Step 3: Cross multiply
   1,288.05x = 1,776.29 × 936.29
4. Step 4: Simplify right side
   1,288.05x = 1,663,109.00
5. Step 5: Solve for x
   x = 1,663,109.00/1,288.05
6. Step 6: Final answer
   x = 1,291.18