Finding the Fourth Proportional to 1,109.35, 1,663.89 and 561.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.35 : 1,663.89 = 561.25 : x
2. Step 2: Convert to fraction form
   1,109.35/1,663.89 = 561.25/x
3. Step 3: Cross multiply
   1,109.35x = 1,663.89 × 561.25
4. Step 4: Simplify right side
   1,109.35x = 933,858.26
5. Step 5: Solve for x
   x = 933,858.26/1,109.35
6. Step 6: Final answer
   x = 841.81