Finding the Fourth Proportional to 1,108.47, 1,663.72 and 561.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,108.47 : 1,663.72 = 561.03 : x
2. Step 2: Convert to fraction form
   1,108.47/1,663.72 = 561.03/x
3. Step 3: Cross multiply
   1,108.47x = 1,663.72 × 561.03
4. Step 4: Simplify right side
   1,108.47x = 933,399.59
5. Step 5: Solve for x
   x = 933,399.59/1,108.47
6. Step 6: Final answer
   x = 842.07