Finding the Fourth Proportional to 1,672.72, 2,308.18 and 926.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,672.72 : 2,308.18 = 926.64 : x
2. Step 2: Convert to fraction form
   1,672.72/2,308.18 = 926.64/x
3. Step 3: Cross multiply
   1,672.72x = 2,308.18 × 926.64
4. Step 4: Simplify right side
   1,672.72x = 2,138,851.92
5. Step 5: Solve for x
   x = 2,138,851.92/1,672.72
6. Step 6: Final answer
   x = 1,278.67