Finding the Fourth Proportional to 13,113.89, 18,097.25 and 7,145.54

Step by Step Solution

1. Step 1: Write the proportion equation
   13,113.89 : 18,097.25 = 7,145.54 : x
2. Step 2: Convert to fraction form
   13,113.89/18,097.25 = 7,145.54/x
3. Step 3: Cross multiply
   13,113.89x = 18,097.25 × 7,145.54
4. Step 4: Simplify right side
   13,113.89x = 129,314,623.77
5. Step 5: Solve for x
   x = 129,314,623.77/13,113.89
6. Step 6: Final answer
   x = 9,860.89