Finding the Fourth Proportional to 1,421.43, 1,961.46 and 791.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,421.43 : 1,961.46 = 791.87 : x
2. Step 2: Convert to fraction form
   1,421.43/1,961.46 = 791.87/x
3. Step 3: Cross multiply
   1,421.43x = 1,961.46 × 791.87
4. Step 4: Simplify right side
   1,421.43x = 1,553,211.52
5. Step 5: Solve for x
   x = 1,553,211.52/1,421.43
6. Step 6: Final answer
   x = 1,092.71