Finding the Fourth Proportional to 1,087.46, 1,627.12 and 647.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.46 : 1,627.12 = 647.10 : x
2. Step 2: Convert to fraction form
   1,087.46/1,627.12 = 647.10/x
3. Step 3: Cross multiply
   1,087.46x = 1,627.12 × 647.10
4. Step 4: Simplify right side
   1,087.46x = 1,052,907.73
5. Step 5: Solve for x
   x = 1,052,907.73/1,087.46
6. Step 6: Final answer
   x = 968.23