Finding the Fourth Proportional to 9,121.16, 12,587.55 and 5,142.41

Step by Step Solution

1. Step 1: Write the proportion equation
   9,121.16 : 12,587.55 = 5,142.41 : x
2. Step 2: Convert to fraction form
   9,121.16/12,587.55 = 5,142.41/x
3. Step 3: Cross multiply
   9,121.16x = 12,587.55 × 5,142.41
4. Step 4: Simplify right side
   9,121.16x = 64,730,372.31
5. Step 5: Solve for x
   x = 64,730,372.31/9,121.16
6. Step 6: Final answer
   x = 7,096.73