Finding the Fourth Proportional to 1,127.61, 1,689.83 and 849.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,127.61 : 1,689.83 = 849.78 : x
2. Step 2: Convert to fraction form
   1,127.61/1,689.83 = 849.78/x
3. Step 3: Cross multiply
   1,127.61x = 1,689.83 × 849.78
4. Step 4: Simplify right side
   1,127.61x = 1,435,983.74
5. Step 5: Solve for x
   x = 1,435,983.74/1,127.61
6. Step 6: Final answer
   x = 1,273.48