Finding the Fourth Proportional to 1,561.05, 2,342.17 and 728.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.05 : 2,342.17 = 728.54 : x
2. Step 2: Convert to fraction form
   1,561.05/2,342.17 = 728.54/x
3. Step 3: Cross multiply
   1,561.05x = 2,342.17 × 728.54
4. Step 4: Simplify right side
   1,561.05x = 1,706,364.53
5. Step 5: Solve for x
   x = 1,706,364.53/1,561.05
6. Step 6: Final answer
   x = 1,093.09