Finding the Fourth Proportional to 1,575.42, 2,174.10 and 986.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,575.42 : 2,174.10 = 986.31 : x
2. Step 2: Convert to fraction form
   1,575.42/2,174.10 = 986.31/x
3. Step 3: Cross multiply
   1,575.42x = 2,174.10 × 986.31
4. Step 4: Simplify right side
   1,575.42x = 2,144,336.57
5. Step 5: Solve for x
   x = 2,144,336.57/1,575.42
6. Step 6: Final answer
   x = 1,361.12