Finding the Fourth Proportional to 8,784.20, 13,063.27 and 8,507.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,784.20 : 13,063.27 = 8,507.30 : x
2. Step 2: Convert to fraction form
   8,784.20/13,063.27 = 8,507.30/x
3. Step 3: Cross multiply
   8,784.20x = 13,063.27 × 8,507.30
4. Step 4: Simplify right side
   8,784.20x = 111,133,156.87
5. Step 5: Solve for x
   x = 111,133,156.87/8,784.20
6. Step 6: Final answer
   x = 12,651.48