Finding the Fourth Proportional to 1,109.03, 1,664.59 and 561.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.03 : 1,664.59 = 561.61 : x
2. Step 2: Convert to fraction form
   1,109.03/1,664.59 = 561.61/x
3. Step 3: Cross multiply
   1,109.03x = 1,664.59 × 561.61
4. Step 4: Simplify right side
   1,109.03x = 934,844.82
5. Step 5: Solve for x
   x = 934,844.82/1,109.03
6. Step 6: Final answer
   x = 842.94