Finding the Fourth Proportional to 1,619.39, 2,234.69 and 911.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,619.39 : 2,234.69 = 911.30 : x
2. Step 2: Convert to fraction form
   1,619.39/2,234.69 = 911.30/x
3. Step 3: Cross multiply
   1,619.39x = 2,234.69 × 911.30
4. Step 4: Simplify right side
   1,619.39x = 2,036,459.55
5. Step 5: Solve for x
   x = 2,036,459.55/1,619.39
6. Step 6: Final answer
   x = 1,257.55