Finding the Fourth Proportional to 9,121.33, 12,587.42 and 5,142.42

Step by Step Solution

1. Step 1: Write the proportion equation
   9,121.33 : 12,587.42 = 5,142.42 : x
2. Step 2: Convert to fraction form
   9,121.33/12,587.42 = 5,142.42/x
3. Step 3: Cross multiply
   9,121.33x = 12,587.42 × 5,142.42
4. Step 4: Simplify right side
   9,121.33x = 64,729,764.66
5. Step 5: Solve for x
   x = 64,729,764.66/9,121.33
6. Step 6: Final answer
   x = 7,096.52