Finding the Fourth Proportional to 12,764.62, 17,610.15 and 9,415.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,764.62 : 17,610.15 = 9,415.50 : x
2. Step 2: Convert to fraction form
   12,764.62/17,610.15 = 9,415.50/x
3. Step 3: Cross multiply
   12,764.62x = 17,610.15 × 9,415.50
4. Step 4: Simplify right side
   12,764.62x = 165,808,367.33
5. Step 5: Solve for x
   x = 165,808,367.33/12,764.62
6. Step 6: Final answer
   x = 12,989.68