Finding the Fourth Proportional to 1,421.98, 1,962.43 and 862.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,421.98 : 1,962.43 = 862.47 : x
2. Step 2: Convert to fraction form
   1,421.98/1,962.43 = 862.47/x
3. Step 3: Cross multiply
   1,421.98x = 1,962.43 × 862.47
4. Step 4: Simplify right side
   1,421.98x = 1,692,534.85
5. Step 5: Solve for x
   x = 1,692,534.85/1,421.98
6. Step 6: Final answer
   x = 1,190.27