Finding the Fourth Proportional to 1,672.38, 2,309.04 and 1,278.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,672.38 : 2,309.04 = 1,278.72 : x
2. Step 2: Convert to fraction form
   1,672.38/2,309.04 = 1,278.72/x
3. Step 3: Cross multiply
   1,672.38x = 2,309.04 × 1,278.72
4. Step 4: Simplify right side
   1,672.38x = 2,952,615.63
5. Step 5: Solve for x
   x = 2,952,615.63/1,672.38
6. Step 6: Final answer
   x = 1,765.52