Finding the Fourth Proportional to 2,219.50, 3,063.32 and 1,288

Step by Step Solution

1. Step 1: Write the proportion equation
   2,219.50 : 3,063.32 = 1,288 : x
2. Step 2: Convert to fraction form
   2,219.50/3,063.32 = 1,288/x
3. Step 3: Cross multiply
   2,219.50x = 3,063.32 × 1,288
4. Step 4: Simplify right side
   2,219.50x = 3,945,556.16
5. Step 5: Solve for x
   x = 3,945,556.16/2,219.50
6. Step 6: Final answer
   x = 1,777.68