Finding the Fourth Proportional to 1,672.86, 2,308.50 and 926.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,672.86 : 2,308.50 = 926.80 : x
2. Step 2: Convert to fraction form
   1,672.86/2,308.50 = 926.80/x
3. Step 3: Cross multiply
   1,672.86x = 2,308.50 × 926.80
4. Step 4: Simplify right side
   1,672.86x = 2,139,517.80
5. Step 5: Solve for x
   x = 2,139,517.80/1,672.86
6. Step 6: Final answer
   x = 1,278.96