Finding the Fourth Proportional to 13,150.70, 18,111.09 and 13,109.70

Step by Step Solution

1. Step 1: Write the proportion equation
   13,150.70 : 18,111.09 = 13,109.70 : x
2. Step 2: Convert to fraction form
   13,150.70/18,111.09 = 13,109.70/x
3. Step 3: Cross multiply
   13,150.70x = 18,111.09 × 13,109.70
4. Step 4: Simplify right side
   13,150.70x = 237,430,971.78
5. Step 5: Solve for x
   x = 237,430,971.78/13,150.70
6. Step 6: Final answer
   x = 18,054.62