Finding the Fourth Proportional to 1,095.59, 1,643.53 and 402.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,095.59 : 1,643.53 = 402.09 : x
2. Step 2: Convert to fraction form
   1,095.59/1,643.53 = 402.09/x
3. Step 3: Cross multiply
   1,095.59x = 1,643.53 × 402.09
4. Step 4: Simplify right side
   1,095.59x = 660,846.98
5. Step 5: Solve for x
   x = 660,846.98/1,095.59
6. Step 6: Final answer
   x = 603.19