Finding the Fourth Proportional to 1,608.56, 2,409.72 and 913.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,608.56 : 2,409.72 = 913.08 : x
2. Step 2: Convert to fraction form
   1,608.56/2,409.72 = 913.08/x
3. Step 3: Cross multiply
   1,608.56x = 2,409.72 × 913.08
4. Step 4: Simplify right side
   1,608.56x = 2,200,267.14
5. Step 5: Solve for x
   x = 2,200,267.14/1,608.56
6. Step 6: Final answer
   x = 1,367.85