Finding the Fourth Proportional to 13,086.32, 18,054.77 and 7,420.37

Step by Step Solution

1. Step 1: Write the proportion equation
   13,086.32 : 18,054.77 = 7,420.37 : x
2. Step 2: Convert to fraction form
   13,086.32/18,054.77 = 7,420.37/x
3. Step 3: Cross multiply
   13,086.32x = 18,054.77 × 7,420.37
4. Step 4: Simplify right side
   13,086.32x = 133,972,946.29
5. Step 5: Solve for x
   x = 133,972,946.29/13,086.32
6. Step 6: Final answer
   x = 10,237.64