Finding the Fourth Proportional to 2,479.69, 3,719.63 and 748.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,479.69 : 3,719.63 = 748.31 : x
2. Step 2: Convert to fraction form
   2,479.69/3,719.63 = 748.31/x
3. Step 3: Cross multiply
   2,479.69x = 3,719.63 × 748.31
4. Step 4: Simplify right side
   2,479.69x = 2,783,447.50
5. Step 5: Solve for x
   x = 2,783,447.50/2,479.69
6. Step 6: Final answer
   x = 1,122.50