Finding the Fourth Proportional to 1,048.96, 1,448.72 and 716.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,048.96 : 1,448.72 = 716.80 : x
2. Step 2: Convert to fraction form
   1,048.96/1,448.72 = 716.80/x
3. Step 3: Cross multiply
   1,048.96x = 1,448.72 × 716.80
4. Step 4: Simplify right side
   1,048.96x = 1,038,442.50
5. Step 5: Solve for x
   x = 1,038,442.50/1,048.96
6. Step 6: Final answer
   x = 989.97