Finding the Fourth Proportional to 1,109.69, 1,662.96 and 616.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.69 : 1,662.96 = 616.31 : x
2. Step 2: Convert to fraction form
   1,109.69/1,662.96 = 616.31/x
3. Step 3: Cross multiply
   1,109.69x = 1,662.96 × 616.31
4. Step 4: Simplify right side
   1,109.69x = 1,024,908.46
5. Step 5: Solve for x
   x = 1,024,908.46/1,109.69
6. Step 6: Final answer
   x = 923.60