Finding the Fourth Proportional to 2,647.16, 3,970.82 and 1,260.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,647.16 : 3,970.82 = 1,260.64 : x
2. Step 2: Convert to fraction form
   2,647.16/3,970.82 = 1,260.64/x
3. Step 3: Cross multiply
   2,647.16x = 3,970.82 × 1,260.64
4. Step 4: Simplify right side
   2,647.16x = 5,005,774.52
5. Step 5: Solve for x
   x = 5,005,774.52/2,647.16
6. Step 6: Final answer
   x = 1,891.00