Finding the Fourth Proportional to 2,724.50, 4,086.78 and 672.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,724.50 : 4,086.78 = 672.50 : x
2. Step 2: Convert to fraction form
   2,724.50/4,086.78 = 672.50/x
3. Step 3: Cross multiply
   2,724.50x = 4,086.78 × 672.50
4. Step 4: Simplify right side
   2,724.50x = 2,748,359.55
5. Step 5: Solve for x
   x = 2,748,359.55/2,724.50
6. Step 6: Final answer
   x = 1,008.76