Finding the Fourth Proportional to 1,048.80, 1,447.72 and 699.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,048.80 : 1,447.72 = 699.50 : x
2. Step 2: Convert to fraction form
   1,048.80/1,447.72 = 699.50/x
3. Step 3: Cross multiply
   1,048.80x = 1,447.72 × 699.50
4. Step 4: Simplify right side
   1,048.80x = 1,012,680.14
5. Step 5: Solve for x
   x = 1,012,680.14/1,048.80
6. Step 6: Final answer
   x = 965.56