Finding the Fourth Proportional to 13,628.18, 18,807.06 and 7,659.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,628.18 : 18,807.06 = 7,659.50 : x
2. Step 2: Convert to fraction form
   13,628.18/18,807.06 = 7,659.50/x
3. Step 3: Cross multiply
   13,628.18x = 18,807.06 × 7,659.50
4. Step 4: Simplify right side
   13,628.18x = 144,052,582.03
5. Step 5: Solve for x
   x = 144,052,582.03/13,628.18
6. Step 6: Final answer
   x = 10,570.20