Finding the Fourth Proportional to 1,677.73, 2,315.25 and 931.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,677.73 : 2,315.25 = 931.69 : x
2. Step 2: Convert to fraction form
   1,677.73/2,315.25 = 931.69/x
3. Step 3: Cross multiply
   1,677.73x = 2,315.25 × 931.69
4. Step 4: Simplify right side
   1,677.73x = 2,157,095.27
5. Step 5: Solve for x
   x = 2,157,095.27/1,677.73
6. Step 6: Final answer
   x = 1,285.72