Finding the Fourth Proportional to 2,653.18, 3,979.72 and 898.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,653.18 : 3,979.72 = 898.57 : x
2. Step 2: Convert to fraction form
   2,653.18/3,979.72 = 898.57/x
3. Step 3: Cross multiply
   2,653.18x = 3,979.72 × 898.57
4. Step 4: Simplify right side
   2,653.18x = 3,576,057.00
5. Step 5: Solve for x
   x = 3,576,057.00/2,653.18
6. Step 6: Final answer
   x = 1,347.84