Finding the Fourth Proportional to 1,141.45, 1,711.86 and 447.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,141.45 : 1,711.86 = 447.63 : x
2. Step 2: Convert to fraction form
   1,141.45/1,711.86 = 447.63/x
3. Step 3: Cross multiply
   1,141.45x = 1,711.86 × 447.63
4. Step 4: Simplify right side
   1,141.45x = 766,279.89
5. Step 5: Solve for x
   x = 766,279.89/1,141.45
6. Step 6: Final answer
   x = 671.32