Finding the Fourth Proportional to 1,095.05, 1,641.60 and 401.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,095.05 : 1,641.60 = 401.56 : x
2. Step 2: Convert to fraction form
   1,095.05/1,641.60 = 401.56/x
3. Step 3: Cross multiply
   1,095.05x = 1,641.60 × 401.56
4. Step 4: Simplify right side
   1,095.05x = 659,196.79
5. Step 5: Solve for x
   x = 659,196.79/1,095.05
6. Step 6: Final answer
   x = 601.98