Finding the Fourth Proportional to 12,165.72, 16,788.78 and 7,130.08

Step by Step Solution

1. Step 1: Write the proportion equation
   12,165.72 : 16,788.78 = 7,130.08 : x
2. Step 2: Convert to fraction form
   12,165.72/16,788.78 = 7,130.08/x
3. Step 3: Cross multiply
   12,165.72x = 16,788.78 × 7,130.08
4. Step 4: Simplify right side
   12,165.72x = 119,705,344.50
5. Step 5: Solve for x
   x = 119,705,344.50/12,165.72
6. Step 6: Final answer
   x = 9,839.56