Finding the Fourth Proportional to 13,288.96, 18,338.10 and 7,320.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,288.96 : 18,338.10 = 7,320.50 : x
2. Step 2: Convert to fraction form
   13,288.96/18,338.10 = 7,320.50/x
3. Step 3: Cross multiply
   13,288.96x = 18,338.10 × 7,320.50
4. Step 4: Simplify right side
   13,288.96x = 134,244,024.45
5. Step 5: Solve for x
   x = 134,244,024.45/13,288.96
6. Step 6: Final answer
   x = 10,101.92