Finding the Fourth Proportional to 1,619.82, 2,235.27 and 911.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,619.82 : 2,235.27 = 911.78 : x
2. Step 2: Convert to fraction form
   1,619.82/2,235.27 = 911.78/x
3. Step 3: Cross multiply
   1,619.82x = 2,235.27 × 911.78
4. Step 4: Simplify right side
   1,619.82x = 2,038,080.07
5. Step 5: Solve for x
   x = 2,038,080.07/1,619.82
6. Step 6: Final answer
   x = 1,258.21