Finding the Fourth Proportional to 9,120.89, 12,586.41 and 5,142.02

Step by Step Solution

1. Step 1: Write the proportion equation
   9,120.89 : 12,586.41 = 5,142.02 : x
2. Step 2: Convert to fraction form
   9,120.89/12,586.41 = 5,142.02/x
3. Step 3: Cross multiply
   9,120.89x = 12,586.41 × 5,142.02
4. Step 4: Simplify right side
   9,120.89x = 64,719,509.02
5. Step 5: Solve for x
   x = 64,719,509.02/9,120.89
6. Step 6: Final answer
   x = 7,095.74