Finding the Fourth Proportional to 12,774.62, 17,623.76 and 8,790.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,774.62 : 17,623.76 = 8,790.50 : x
2. Step 2: Convert to fraction form
   12,774.62/17,623.76 = 8,790.50/x
3. Step 3: Cross multiply
   12,774.62x = 17,623.76 × 8,790.50
4. Step 4: Simplify right side
   12,774.62x = 154,921,662.28
5. Step 5: Solve for x
   x = 154,921,662.28/12,774.62
6. Step 6: Final answer
   x = 12,127.30