Finding the Fourth Proportional to 8,736.94, 12,059.31 and 5,380.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,736.94 : 12,059.31 = 5,380.30 : x
2. Step 2: Convert to fraction form
   8,736.94/12,059.31 = 5,380.30/x
3. Step 3: Cross multiply
   8,736.94x = 12,059.31 × 5,380.30
4. Step 4: Simplify right side
   8,736.94x = 64,882,705.59
5. Step 5: Solve for x
   x = 64,882,705.59/8,736.94
6. Step 6: Final answer
   x = 7,426.25