Finding the Fourth Proportional to 1,142.31, 1,711.98 and 448.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,142.31 : 1,711.98 = 448.32 : x
2. Step 2: Convert to fraction form
   1,142.31/1,711.98 = 448.32/x
3. Step 3: Cross multiply
   1,142.31x = 1,711.98 × 448.32
4. Step 4: Simplify right side
   1,142.31x = 767,514.87
5. Step 5: Solve for x
   x = 767,514.87/1,142.31
6. Step 6: Final answer
   x = 671.90