Finding the Fourth Proportional to 12,864.80, 17,754.28 and 7,200.04

Step by Step Solution

1. Step 1: Write the proportion equation
   12,864.80 : 17,754.28 = 7,200.04 : x
2. Step 2: Convert to fraction form
   12,864.80/17,754.28 = 7,200.04/x
3. Step 3: Cross multiply
   12,864.80x = 17,754.28 × 7,200.04
4. Step 4: Simplify right side
   12,864.80x = 127,831,526.17
5. Step 5: Solve for x
   x = 127,831,526.17/12,864.80
6. Step 6: Final answer
   x = 9,936.53