Finding the Fourth Proportional to 1,618.31, 2,233.28 and 919.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,618.31 : 2,233.28 = 919.82 : x
2. Step 2: Convert to fraction form
   1,618.31/2,233.28 = 919.82/x
3. Step 3: Cross multiply
   1,618.31x = 2,233.28 × 919.82
4. Step 4: Simplify right side
   1,618.31x = 2,054,216.59
5. Step 5: Solve for x
   x = 2,054,216.59/1,618.31
6. Step 6: Final answer
   x = 1,269.36