Finding the Fourth Proportional to 12,949.56, 17,868.30 and 7,643.64

Step by Step Solution

1. Step 1: Write the proportion equation
   12,949.56 : 17,868.30 = 7,643.64 : x
2. Step 2: Convert to fraction form
   12,949.56/17,868.30 = 7,643.64/x
3. Step 3: Cross multiply
   12,949.56x = 17,868.30 × 7,643.64
4. Step 4: Simplify right side
   12,949.56x = 136,578,852.61
5. Step 5: Solve for x
   x = 136,578,852.61/12,949.56
6. Step 6: Final answer
   x = 10,546.99