Finding the Fourth Proportional to 9,121.02, 12,586.91 and 5,143.42

Step by Step Solution

1. Step 1: Write the proportion equation
   9,121.02 : 12,586.91 = 5,143.42 : x
2. Step 2: Convert to fraction form
   9,121.02/12,586.91 = 5,143.42/x
3. Step 3: Cross multiply
   9,121.02x = 12,586.91 × 5,143.42
4. Step 4: Simplify right side
   9,121.02x = 64,739,746.02
5. Step 5: Solve for x
   x = 64,739,746.02/9,121.02
6. Step 6: Final answer
   x = 7,097.86