Finding the Fourth Proportional to 1,677.89, 2,315.43 and 931.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,677.89 : 2,315.43 = 931.86 : x
2. Step 2: Convert to fraction form
   1,677.89/2,315.43 = 931.86/x
3. Step 3: Cross multiply
   1,677.89x = 2,315.43 × 931.86
4. Step 4: Simplify right side
   1,677.89x = 2,157,656.60
5. Step 5: Solve for x
   x = 2,157,656.60/1,677.89
6. Step 6: Final answer
   x = 1,285.94