Finding the Fourth Proportional to 13,145.31, 18,140.42 and 7,176.94

Step by Step Solution

1. Step 1: Write the proportion equation
   13,145.31 : 18,140.42 = 7,176.94 : x
2. Step 2: Convert to fraction form
   13,145.31/18,140.42 = 7,176.94/x
3. Step 3: Cross multiply
   13,145.31x = 18,140.42 × 7,176.94
4. Step 4: Simplify right side
   13,145.31x = 130,192,678.51
5. Step 5: Solve for x
   x = 130,192,678.51/13,145.31
6. Step 6: Final answer
   x = 9,904.12