Finding the Fourth Proportional to 1,176.69, 1,623.83 and 645.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,176.69 : 1,623.83 = 645.58 : x
2. Step 2: Convert to fraction form
   1,176.69/1,623.83 = 645.58/x
3. Step 3: Cross multiply
   1,176.69x = 1,623.83 × 645.58
4. Step 4: Simplify right side
   1,176.69x = 1,048,309.73
5. Step 5: Solve for x
   x = 1,048,309.73/1,176.69
6. Step 6: Final answer
   x = 890.90