Finding the Fourth Proportional to 2,653.16, 3,978.69 and 897.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,653.16 : 3,978.69 = 897.68 : x
2. Step 2: Convert to fraction form
   2,653.16/3,978.69 = 897.68/x
3. Step 3: Cross multiply
   2,653.16x = 3,978.69 × 897.68
4. Step 4: Simplify right side
   2,653.16x = 3,571,570.55
5. Step 5: Solve for x
   x = 3,571,570.55/2,653.16
6. Step 6: Final answer
   x = 1,346.16