Finding the Fourth Proportional to 13,428.77, 18,528.72 and 8,123.48

Step by Step Solution

1. Step 1: Write the proportion equation
   13,428.77 : 18,528.72 = 8,123.48 : x
2. Step 2: Convert to fraction form
   13,428.77/18,528.72 = 8,123.48/x
3. Step 3: Cross multiply
   13,428.77x = 18,528.72 × 8,123.48
4. Step 4: Simplify right side
   13,428.77x = 150,517,686.35
5. Step 5: Solve for x
   x = 150,517,686.35/13,428.77
6. Step 6: Final answer
   x = 11,208.60