Finding the Fourth Proportional to 12,003.69, 18,003.47 and 5,428.35

Step by Step Solution

1. Step 1: Write the proportion equation
   12,003.69 : 18,003.47 = 5,428.35 : x
2. Step 2: Convert to fraction form
   12,003.69/18,003.47 = 5,428.35/x
3. Step 3: Cross multiply
   12,003.69x = 18,003.47 × 5,428.35
4. Step 4: Simplify right side
   12,003.69x = 97,729,109.23
5. Step 5: Solve for x
   x = 97,729,109.23/12,003.69
6. Step 6: Final answer
   x = 8,141.59