Finding the Fourth Proportional to 13,144.86, 18,140.37 and 7,177.05

Step by Step Solution

1. Step 1: Write the proportion equation
   13,144.86 : 18,140.37 = 7,177.05 : x
2. Step 2: Convert to fraction form
   13,144.86/18,140.37 = 7,177.05/x
3. Step 3: Cross multiply
   13,144.86x = 18,140.37 × 7,177.05
4. Step 4: Simplify right side
   13,144.86x = 130,194,342.51
5. Step 5: Solve for x
   x = 130,194,342.51/13,144.86
6. Step 6: Final answer
   x = 9,904.58