Finding the Fourth Proportional to 9,121.68, 12,588.12 and 5,142.48

Step by Step Solution

1. Step 1: Write the proportion equation
   9,121.68 : 12,588.12 = 5,142.48 : x
2. Step 2: Convert to fraction form
   9,121.68/12,588.12 = 5,142.48/x
3. Step 3: Cross multiply
   9,121.68x = 12,588.12 × 5,142.48
4. Step 4: Simplify right side
   9,121.68x = 64,734,155.34
5. Step 5: Solve for x
   x = 64,734,155.34/9,121.68
6. Step 6: Final answer
   x = 7,096.74