Finding the Fourth Proportional to 13,180.79, 18,189.50 and 7,212.51

Step by Step Solution

1. Step 1: Write the proportion equation
   13,180.79 : 18,189.50 = 7,212.51 : x
2. Step 2: Convert to fraction form
   13,180.79/18,189.50 = 7,212.51/x
3. Step 3: Cross multiply
   13,180.79x = 18,189.50 × 7,212.51
4. Step 4: Simplify right side
   13,180.79x = 131,191,914.58
5. Step 5: Solve for x
   x = 131,191,914.58/13,180.79
6. Step 6: Final answer
   x = 9,953.26