Finding the Fourth Proportional to 12,087.12, 18,131.10 and 8,592.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,087.12 : 18,131.10 = 8,592.78 : x
2. Step 2: Convert to fraction form
   12,087.12/18,131.10 = 8,592.78/x
3. Step 3: Cross multiply
   12,087.12x = 18,131.10 × 8,592.78
4. Step 4: Simplify right side
   12,087.12x = 155,796,553.46
5. Step 5: Solve for x
   x = 155,796,553.46/12,087.12
6. Step 6: Final answer
   x = 12,889.47