Finding the Fourth Proportional to 1,089.32, 1,634.18 and 359.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,089.32 : 1,634.18 = 359.10 : x
2. Step 2: Convert to fraction form
   1,089.32/1,634.18 = 359.10/x
3. Step 3: Cross multiply
   1,089.32x = 1,634.18 × 359.10
4. Step 4: Simplify right side
   1,089.32x = 586,834.04
5. Step 5: Solve for x
   x = 586,834.04/1,089.32
6. Step 6: Final answer
   x = 538.72