Finding the Fourth Proportional to 1,227.69, 1,691.87 and 877.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,227.69 : 1,691.87 = 877.77 : x
2. Step 2: Convert to fraction form
   1,227.69/1,691.87 = 877.77/x
3. Step 3: Cross multiply
   1,227.69x = 1,691.87 × 877.77
4. Step 4: Simplify right side
   1,227.69x = 1,485,064.27
5. Step 5: Solve for x
   x = 1,485,064.27/1,227.69
6. Step 6: Final answer
   x = 1,209.65