Finding the Fourth Proportional to 8,736.28, 12,056.89 and 5,381.05

Step by Step Solution

1. Step 1: Write the proportion equation
   8,736.28 : 12,056.89 = 5,381.05 : x
2. Step 2: Convert to fraction form
   8,736.28/12,056.89 = 5,381.05/x
3. Step 3: Cross multiply
   8,736.28x = 12,056.89 × 5,381.05
4. Step 4: Simplify right side
   8,736.28x = 64,878,727.93
5. Step 5: Solve for x
   x = 64,878,727.93/8,736.28
6. Step 6: Final answer
   x = 7,426.36