Finding the Fourth Proportional to 12,364.16, 17,064.78 and 7,889.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,364.16 : 17,064.78 = 7,889.30 : x
2. Step 2: Convert to fraction form
   12,364.16/17,064.78 = 7,889.30/x
3. Step 3: Cross multiply
   12,364.16x = 17,064.78 × 7,889.30
4. Step 4: Simplify right side
   12,364.16x = 134,629,168.85
5. Step 5: Solve for x
   x = 134,629,168.85/12,364.16
6. Step 6: Final answer
   x = 10,888.66