Finding the Fourth Proportional to 1,173.86, 1,761.48 and 443.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,173.86 : 1,761.48 = 443.50 : x
2. Step 2: Convert to fraction form
   1,173.86/1,761.48 = 443.50/x
3. Step 3: Cross multiply
   1,173.86x = 1,761.48 × 443.50
4. Step 4: Simplify right side
   1,173.86x = 781,216.38
5. Step 5: Solve for x
   x = 781,216.38/1,173.86
6. Step 6: Final answer
   x = 665.51