Finding the Fourth Proportional to 8,736.10, 12,056.78 and 5,378.24

Step by Step Solution

1. Step 1: Write the proportion equation
   8,736.10 : 12,056.78 = 5,378.24 : x
2. Step 2: Convert to fraction form
   8,736.10/12,056.78 = 5,378.24/x
3. Step 3: Cross multiply
   8,736.10x = 12,056.78 × 5,378.24
4. Step 4: Simplify right side
   8,736.10x = 64,844,256.47
5. Step 5: Solve for x
   x = 64,844,256.47/8,736.10
6. Step 6: Final answer
   x = 7,422.56