Finding the Fourth Proportional to 1,672.76, 2,308.41 and 926.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,672.76 : 2,308.41 = 926.78 : x
2. Step 2: Convert to fraction form
   1,672.76/2,308.41 = 926.78/x
3. Step 3: Cross multiply
   1,672.76x = 2,308.41 × 926.78
4. Step 4: Simplify right side
   1,672.76x = 2,139,376.68
5. Step 5: Solve for x
   x = 2,139,376.68/1,672.76
6. Step 6: Final answer
   x = 1,278.95