Finding the Fourth Proportional to 1,628.88, 2,247.72 and 1,007.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,628.88 : 2,247.72 = 1,007.76 : x
2. Step 2: Convert to fraction form
   1,628.88/2,247.72 = 1,007.76/x
3. Step 3: Cross multiply
   1,628.88x = 2,247.72 × 1,007.76
4. Step 4: Simplify right side
   1,628.88x = 2,265,162.31
5. Step 5: Solve for x
   x = 2,265,162.31/1,628.88
6. Step 6: Final answer
   x = 1,390.63