Finding the Fourth Proportional to 1,081.33, 1,618.89 and 618.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.33 : 1,618.89 = 618.28 : x
2. Step 2: Convert to fraction form
   1,081.33/1,618.89 = 618.28/x
3. Step 3: Cross multiply
   1,081.33x = 1,618.89 × 618.28
4. Step 4: Simplify right side
   1,081.33x = 1,000,927.31
5. Step 5: Solve for x
   x = 1,000,927.31/1,081.33
6. Step 6: Final answer
   x = 925.64