Finding the Fourth Proportional to 13,097.99, 18,091.45 and 9,507.21

Step by Step Solution

1. Step 1: Write the proportion equation
   13,097.99 : 18,091.45 = 9,507.21 : x
2. Step 2: Convert to fraction form
   13,097.99/18,091.45 = 9,507.21/x
3. Step 3: Cross multiply
   13,097.99x = 18,091.45 × 9,507.21
4. Step 4: Simplify right side
   13,097.99x = 171,999,158.40
5. Step 5: Solve for x
   x = 171,999,158.40/13,097.99
6. Step 6: Final answer
   x = 13,131.72