Finding the Fourth Proportional to 1,122.27, 1,685.83 and 917.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,122.27 : 1,685.83 = 917.34 : x
2. Step 2: Convert to fraction form
   1,122.27/1,685.83 = 917.34/x
3. Step 3: Cross multiply
   1,122.27x = 1,685.83 × 917.34
4. Step 4: Simplify right side
   1,122.27x = 1,546,472.40
5. Step 5: Solve for x
   x = 1,546,472.40/1,122.27
6. Step 6: Final answer
   x = 1,377.99