Finding the Fourth Proportional to 12,788, 17,648.18 and 7,199.36

Step by Step Solution

1. Step 1: Write the proportion equation
   12,788 : 17,648.18 = 7,199.36 : x
2. Step 2: Convert to fraction form
   12,788/17,648.18 = 7,199.36/x
3. Step 3: Cross multiply
   12,788x = 17,648.18 × 7,199.36
4. Step 4: Simplify right side
   12,788x = 127,055,601.16
5. Step 5: Solve for x
   x = 127,055,601.16/12,788
6. Step 6: Final answer
   x = 9,935.53