Finding the Fourth Proportional to 1,672.84, 2,308.55 and 926.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,672.84 : 2,308.55 = 926.78 : x
2. Step 2: Convert to fraction form
   1,672.84/2,308.55 = 926.78/x
3. Step 3: Cross multiply
   1,672.84x = 2,308.55 × 926.78
4. Step 4: Simplify right side
   1,672.84x = 2,139,501.79
5. Step 5: Solve for x
   x = 2,139,501.79/1,672.84
6. Step 6: Final answer
   x = 1,278.97