Finding the Fourth Proportional to 1,538.72, 2,306.76 and 672.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,538.72 : 2,306.76 = 672.36 : x
2. Step 2: Convert to fraction form
   1,538.72/2,306.76 = 672.36/x
3. Step 3: Cross multiply
   1,538.72x = 2,306.76 × 672.36
4. Step 4: Simplify right side
   1,538.72x = 1,550,973.15
5. Step 5: Solve for x
   x = 1,550,973.15/1,538.72
6. Step 6: Final answer
   x = 1,007.96