Finding the Fourth Proportional to 13,150.76, 18,147.37 and 7,181.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,150.76 : 18,147.37 = 7,181.28 : x
2. Step 2: Convert to fraction form
   13,150.76/18,147.37 = 7,181.28/x
3. Step 3: Cross multiply
   13,150.76x = 18,147.37 × 7,181.28
4. Step 4: Simplify right side
   13,150.76x = 130,321,345.23
5. Step 5: Solve for x
   x = 130,321,345.23/13,150.76
6. Step 6: Final answer
   x = 9,909.80