Finding the Fourth Proportional to 12,904.32, 17,809.12 and 7,868.82

Step by Step Solution

1. Step 1: Write the proportion equation
   12,904.32 : 17,809.12 = 7,868.82 : x
2. Step 2: Convert to fraction form
   12,904.32/17,809.12 = 7,868.82/x
3. Step 3: Cross multiply
   12,904.32x = 17,809.12 × 7,868.82
4. Step 4: Simplify right side
   12,904.32x = 140,136,759.64
5. Step 5: Solve for x
   x = 140,136,759.64/12,904.32
6. Step 6: Final answer
   x = 10,859.68