Finding the Fourth Proportional to 12,997.98, 17,918.55 and 9,265.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,997.98 : 17,918.55 = 9,265.50 : x
2. Step 2: Convert to fraction form
   12,997.98/17,918.55 = 9,265.50/x
3. Step 3: Cross multiply
   12,997.98x = 17,918.55 × 9,265.50
4. Step 4: Simplify right side
   12,997.98x = 166,024,325.03
5. Step 5: Solve for x
   x = 166,024,325.03/12,997.98
6. Step 6: Final answer
   x = 12,773.09