Finding the Fourth Proportional to 1,109.13, 1,664.72 and 561.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.13 : 1,664.72 = 561.69 : x
2. Step 2: Convert to fraction form
   1,109.13/1,664.72 = 561.69/x
3. Step 3: Cross multiply
   1,109.13x = 1,664.72 × 561.69
4. Step 4: Simplify right side
   1,109.13x = 935,060.56
5. Step 5: Solve for x
   x = 935,060.56/1,109.13
6. Step 6: Final answer
   x = 843.06