Finding the Fourth Proportional to 8,527.30, 12,810.15 and 8,200.90

Step by Step Solution

1. Step 1: Write the proportion equation
   8,527.30 : 12,810.15 = 8,200.90 : x
2. Step 2: Convert to fraction form
   8,527.30/12,810.15 = 8,200.90/x
3. Step 3: Cross multiply
   8,527.30x = 12,810.15 × 8,200.90
4. Step 4: Simplify right side
   8,527.30x = 105,054,759.14
5. Step 5: Solve for x
   x = 105,054,759.14/8,527.30
6. Step 6: Final answer
   x = 12,319.82