Finding the Fourth Proportional to 1,099.05, 1,645.05 and 610.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,099.05 : 1,645.05 = 610.89 : x
2. Step 2: Convert to fraction form
   1,099.05/1,645.05 = 610.89/x
3. Step 3: Cross multiply
   1,099.05x = 1,645.05 × 610.89
4. Step 4: Simplify right side
   1,099.05x = 1,004,944.59
5. Step 5: Solve for x
   x = 1,004,944.59/1,099.05
6. Step 6: Final answer
   x = 914.38