Finding the Fourth Proportional to 13,695.50, 18,890.06 and 13,238.25

Step by Step Solution

1. Step 1: Write the proportion equation
   13,695.50 : 18,890.06 = 13,238.25 : x
2. Step 2: Convert to fraction form
   13,695.50/18,890.06 = 13,238.25/x
3. Step 3: Cross multiply
   13,695.50x = 18,890.06 × 13,238.25
4. Step 4: Simplify right side
   13,695.50x = 250,071,270.60
5. Step 5: Solve for x
   x = 250,071,270.60/13,695.50
6. Step 6: Final answer
   x = 18,259.38