Finding the Fourth Proportional to 1,109.45, 1,665.16 and 561.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.45 : 1,665.16 = 561.94 : x
2. Step 2: Convert to fraction form
   1,109.45/1,665.16 = 561.94/x
3. Step 3: Cross multiply
   1,109.45x = 1,665.16 × 561.94
4. Step 4: Simplify right side
   1,109.45x = 935,714.44
5. Step 5: Solve for x
   x = 935,714.44/1,109.45
6. Step 6: Final answer
   x = 843.41