Finding the Fourth Proportional to 12,123.77, 18,173.47 and 5,105.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,123.77 : 18,173.47 = 5,105.50 : x
2. Step 2: Convert to fraction form
   12,123.77/18,173.47 = 5,105.50/x
3. Step 3: Cross multiply
   12,123.77x = 18,173.47 × 5,105.50
4. Step 4: Simplify right side
   12,123.77x = 92,784,651.09
5. Step 5: Solve for x
   x = 92,784,651.09/12,123.77
6. Step 6: Final answer
   x = 7,653.12