Finding the Fourth Proportional to 9,121.48, 12,587.42 and 5,142.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,121.48 : 12,587.42 = 5,142.56 : x
2. Step 2: Convert to fraction form
   9,121.48/12,587.42 = 5,142.56/x
3. Step 3: Cross multiply
   9,121.48x = 12,587.42 × 5,142.56
4. Step 4: Simplify right side
   9,121.48x = 64,731,562.60
5. Step 5: Solve for x
   x = 64,731,562.60/9,121.48
6. Step 6: Final answer
   x = 7,096.61