Finding the Fourth Proportional to 1,109.40, 1,665.45 and 616.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.40 : 1,665.45 = 616.20 : x
2. Step 2: Convert to fraction form
   1,109.40/1,665.45 = 616.20/x
3. Step 3: Cross multiply
   1,109.40x = 1,665.45 × 616.20
4. Step 4: Simplify right side
   1,109.40x = 1,026,250.29
5. Step 5: Solve for x
   x = 1,026,250.29/1,109.40
6. Step 6: Final answer
   x = 925.05