Finding the Fourth Proportional to 1,672.96, 2,308.73 and 926.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,672.96 : 2,308.73 = 926.90 : x
2. Step 2: Convert to fraction form
   1,672.96/2,308.73 = 926.90/x
3. Step 3: Cross multiply
   1,672.96x = 2,308.73 × 926.90
4. Step 4: Simplify right side
   1,672.96x = 2,139,969.93
5. Step 5: Solve for x
   x = 2,139,969.93/1,672.96
6. Step 6: Final answer
   x = 1,279.15