Finding the Fourth Proportional to 1,427.42, 1,970.34 and 986.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,427.42 : 1,970.34 = 986.42 : x
2. Step 2: Convert to fraction form
   1,427.42/1,970.34 = 986.42/x
3. Step 3: Cross multiply
   1,427.42x = 1,970.34 × 986.42
4. Step 4: Simplify right side
   1,427.42x = 1,943,582.78
5. Step 5: Solve for x
   x = 1,943,582.78/1,427.42
6. Step 6: Final answer
   x = 1,361.61