Finding the Fourth Proportional to 1,605.32, 2,405.46 and 911.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,605.32 : 2,405.46 = 911.12 : x
2. Step 2: Convert to fraction form
   1,605.32/2,405.46 = 911.12/x
3. Step 3: Cross multiply
   1,605.32x = 2,405.46 × 911.12
4. Step 4: Simplify right side
   1,605.32x = 2,191,662.72
5. Step 5: Solve for x
   x = 2,191,662.72/1,605.32
6. Step 6: Final answer
   x = 1,365.25