Finding the Fourth Proportional to 12,445.79, 17,175.65 and 7,664.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,445.79 : 17,175.65 = 7,664.76 : x
2. Step 2: Convert to fraction form
   12,445.79/17,175.65 = 7,664.76/x
3. Step 3: Cross multiply
   12,445.79x = 17,175.65 × 7,664.76
4. Step 4: Simplify right side
   12,445.79x = 131,647,196.77
5. Step 5: Solve for x
   x = 131,647,196.77/12,445.79
6. Step 6: Final answer
   x = 10,577.65