Finding the Fourth Proportional to 10,981.55, 15,156.70 and 8,586.79

Step by Step Solution

1. Step 1: Write the proportion equation
   10,981.55 : 15,156.70 = 8,586.79 : x
2. Step 2: Convert to fraction form
   10,981.55/15,156.70 = 8,586.79/x
3. Step 3: Cross multiply
   10,981.55x = 15,156.70 × 8,586.79
4. Step 4: Simplify right side
   10,981.55x = 130,147,340.63
5. Step 5: Solve for x
   x = 130,147,340.63/10,981.55
6. Step 6: Final answer
   x = 11,851.45