Finding the Fourth Proportional to 1,672.87, 2,308.68 and 926.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,672.87 : 2,308.68 = 926.89 : x
2. Step 2: Convert to fraction form
   1,672.87/2,308.68 = 926.89/x
3. Step 3: Cross multiply
   1,672.87x = 2,308.68 × 926.89
4. Step 4: Simplify right side
   1,672.87x = 2,139,892.41
5. Step 5: Solve for x
   x = 2,139,892.41/1,672.87
6. Step 6: Final answer
   x = 1,279.17