Finding the Fourth Proportional to 12,127.78, 18,156.84 and 10,861.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,127.78 : 18,156.84 = 10,861.48 : x
2. Step 2: Convert to fraction form
   12,127.78/18,156.84 = 10,861.48/x
3. Step 3: Cross multiply
   12,127.78x = 18,156.84 × 10,861.48
4. Step 4: Simplify right side
   12,127.78x = 197,210,154.52
5. Step 5: Solve for x
   x = 197,210,154.52/12,127.78
6. Step 6: Final answer
   x = 16,261.03